Cita APA (7th ed.)
Gill, P. (1987). A textbook of machine drawing (11th ed.). Katson.
Cita Chicago (17th ed.)
Gill, P.S. A Textbook of Machine Drawing. 11th ed. Delhi: Katson, 1987.
Cita MLA (9th ed.)
Gill, P.S. A Textbook of Machine Drawing. 11th ed. Katson, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.