APA aipamena

Hedderson, J. (1991). SPSS/PC+ made simple. Wadsworth Pub. Co.

Chicago Style aipamena

Hedderson, John. SPSS/PC+ Made Simple. Belmont, Calif: Wadsworth Pub. Co, 1991.

MLA aipamena

Hedderson, John. SPSS/PC+ Made Simple. Wadsworth Pub. Co, 1991.