Cita APA (7a ed.)

Douglass, M. E., & Wigley, G. (1998). ABC: Time tips. McGraw-Hill.

Cita Chicago Style (17a ed.)

Douglass, Merrill E., y Gary Wigley. ABC: Time Tips. New York [etc.]: McGraw-Hill, 1998.

Cita MLA (9a ed.)

Douglass, Merrill E., y Gary Wigley. ABC: Time Tips. McGraw-Hill, 1998.