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This is the link to the core rule book for First Editionhttps://www.amazon.com/Warhammer-Fantasy-Roleplay-Perilous-Adventure/dp/1899749012
This is the link to the Second Edition core rule book: https://www.amazon.com/Warhammer-Fantasy-Roleplay-Rulebook-Green/dp/1844162206
Third Edition comes in a boxed set.
Your best bet for finding the first two is used on ebay or from a google search. The Third edition box is FantasyFlightGames.com or ebay. Good luck!