Παραπομπή APA

Spence, R. (1991). Clipper, programming guide (2nd ed.). B.P.B. publications.

Παραπομπή Chicago Style

Spence, Rick. Clipper, Programming Guide. 2nd ed. Delhi: B.P.B. publications, 1991.

Παραπομπή MLA

Spence, Rick. Clipper, Programming Guide. 2nd ed. B.P.B. publications, 1991.