APA (7th ed.) Citation

Halpin, T., & Girle, R. (1981). Deductive logic (2. ed.). Logiqpress.

Chicago Style (17th ed.) Citation

Halpin, Terry, and Rod Girle. Deductive Logic. 2. ed. Strathpine, Qld: Logiqpress, 1981.

MLA (9th ed.) Citation

Halpin, Terry, and Rod Girle. Deductive Logic. 2. ed. Logiqpress, 1981.