APA-referens (7:e uppl.)
Agor, R. (2014). Civil engineering: Conventional and objective with multiple choice questions and answers (29th ed.). Khanna Publishers.
Chicago-referens (17:e uppl.)
Agor, R. Civil Engineering: Conventional and Objective with Multiple Choice Questions and Answers. 29th ed. New Delhi: Khanna Publishers, 2014.
MLA-referens (9:e uppl.)
Agor, R. Civil Engineering: Conventional and Objective with Multiple Choice Questions and Answers. 29th ed. Khanna Publishers, 2014.
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