Gibson, R. L., & Mitchell, M. (1999). Introduction to counseling and guidance (5th ed.). Merrill.
Cita Chicago (17th ed.)Gibson, Robert L., i Marianne Mitchell. Introduction to Counseling and Guidance. 5th ed. New Jersey: Merrill, 1999.
Cita MLA (9th ed.)Gibson, Robert L., i Marianne Mitchell. Introduction to Counseling and Guidance. 5th ed. Merrill, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.