Cita APA (7th ed.)

Spencer, L. M. (1993). Competence at Work (11th.). McGraw-Hill.

Cita Chicago (17th ed.)

Spencer, Lyle M. Competence at Work. 11th. Singapore: McGraw-Hill, 1993.

Cita MLA (9th ed.)

Spencer, Lyle M. Competence at Work. 11th. McGraw-Hill, 1993.