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SIKHISM (4TruthNet) is a very good summary of Sikhism with evangelism advice.
Sikhism by Josh McDowell & Andrew Stewart is a very good place to begin.
Sikhism by Bill Honsberger (Haven Ministries)
Sikhism by Rev. Johnson Thomaskutty
Sikhism in Crisis - Proliferation of Cults and Sects in Punjab by Pritam Singh Sandhu