A role-playing game (RPG and sometimes roleplaying game) is a game in which players assume the roles of characters in a fictional setting. Players take responsibility for acting out these roles within a narrative, either through literal acting or through a process of structured decision-making or character development. Actions taken within many games succeed or fail according to a formal system of rules and guidelines.

There are several forms of RPG. The original form, sometimes called the tabletop RPG, is conducted through discussion, whereas in live action role-playing games (LARP) players physically perform their characters' actions. In both of these forms, an arranger called a game master (GM) usually decides on the rules and setting to be used and acts as referee, while each of the other players plays the role of a single character. -Wikipedia

Dungeon master's guide (5^th ed.)
GM 069

Monster manual. (5^th ed.)
GM 068

Player's handbook (5^th ed.)
GN 066

Dungeons & dragons dungeon master's guide : roleplaying game core rules Call number: GN 051
The Dungeon master's guide features the 4th edition game rules and guidelines for creating and running encounters, adventures, and campaigns.  It offers a wealth of advice to new and experienced dungeon masters, and includes essential game rules for awarding experience, distributing treasure, creating nonplayer characters, and adding mighty artifacts to the game

Player's handbook : arcane, divine, and martial heroes : roleplaying game core rules Call number: GM 053
"The Player's handbook features the 4th edition game rules, including character creation, combat and adventuring, classes and races, equipment and magic items, skills, feats, powers, and more"

Monster manual : roleplaying game core rules Call number: GM 052
4th edition
Describes the characteristics and attributes of a variety of monsters, zombies, demons, giants, werewolves, animals, and aliens for use in the Dungeons and Dragons game.

Pathfinder roleplaying game. Core rulebook  Call number: GM 041
Based on the original roleplaying game rules designed by Gary Gygax and Dave Arneson

Pathfinder roleplaying game : beginner box Call number: GM 036
This beginner's box contains the simple rules as a first step into a world of fantasy adventure. Players can create and customize their own hero along with challenging adventures and deadly battles against villainous monsters.

GURPS basic set : characters Call number:GM 044 4th edition

GURPS basic set : campaigns GM 045 4th edition This book is intended for Game Masters and advanced players. It covers physical feats, combat, vehicles and technology, animals and monsters, world design, and Game Mastering

Space Call number: GM: 046 4th edition This volume will help you create campaigns of every style, from science fantasy to space opera to realistic. Recreate your favorite science-fiction background, or develop an original world of your own.

Supers Call number:GM 047 4th edition This volume  is a comprehensive playbook to the supers genre and to capturing it in your campaign. It is focused on drama and characterization. GURPS supers is a new work, but it draws from the previous editions of GURPS supers. Using it to run a GURPS campaign requires the GURPS basic set and Gurps supers. The material on genre conventions, character concepts and relationships, scenario creation, and supers universes can be used with any game system.