This guide can be your starting place for finding reliable information resources.
New to PE? Read these!
Books you can get from the shelves
Devereux, S. (1999). Drilling for oil & gas: a nontechnical guide. Tulsa, OK: PennWell. (General Collection: TN871.2 D477 1999)
Hyne, N. J. (2012). Nontechnical guide to petroleum geology, exploration, drilling, and production. Tulsa, OK: Penn Well Corp. (General Collection: TN870.5 H9624 2012)
Online books (Click on the image!)