Cita APA (7th ed.)
Hedderson, J. (1986). SPSSx Made simple. Wadsworth publ. Co..
Cita Chicago (17th ed.)
Hedderson, John. SPSSx Made Simple. California: Wadsworth publ. Co., 1986.
Cita MLA (9th ed.)
Hedderson, John. SPSSx Made Simple. Wadsworth publ. Co., 1986.
Atenció: Aquestes cites poden no estar 100% correctes.