Παραπομπή APA

Bittnger, M. L. (1970). Logic and Proof. Addison-weslen publishing company.

Παραπομπή Chicago Style

Bittnger, Marvin L. Logic and Proof. California: Addison-weslen publishing company, 1970.

Παραπομπή MLA

Bittnger, Marvin L. Logic and Proof. Addison-weslen publishing company, 1970.