Cita APA (7th ed.)

Packard, W. V. (1979). Laytime calculating. Fairplay.

Cita Chicago (17th ed.)

Packard, William V. Laytime Calculating. Londres: Fairplay, 1979.

Cita MLA (9th ed.)

Packard, William V. Laytime Calculating. Fairplay, 1979.