Cita APA (7th ed.)

Willson, R. F. (1980). Writing: Analysis and applications. Instructor's manual and key. Macmillan Publishing.

Cita Chicago (17th ed.)

Willson, Robert F. Writing: Analysis and Applications. Instructor's Manual and Key. Nueva York: Macmillan Publishing, 1980.

Cita MLA (9th ed.)

Willson, Robert F. Writing: Analysis and Applications. Instructor's Manual and Key. Macmillan Publishing, 1980.