Cita APA

Douglass, M. E., & Douglass, M. E. (1998). ABC time tips. New York: McGraw-Hill.

Citación estilo Chicago

Douglass, Merrill E., y Merrill E. Douglass. ABC Time Tips. New York: McGraw-Hill, 1998.

Cita MLA

Douglass, Merrill E., y Merrill E. Douglass. ABC Time Tips. New York: McGraw-Hill, 1998.