APA-referens (7:e uppl.)

Sheng, C. (1969). Threshold logic. Ryerson Press; Academic Press.

Chicago-referens (17:e uppl.)

Sheng, Chʻing-lai. Threshold Logic. Toronto, London, New York: Ryerson Press; Academic Press, 1969.

MLA-referens (8:e uppl.)

Sheng, Chʻing-lai. Threshold Logic. Ryerson Press; Academic Press, 1969.