Παραπομπή APA

Heckel, P. (1984). Elements friendly software design. A Warner Communications Company.

Παραπομπή Chicago Style

Heckel, Paul. Elements Friendly Software Design. USA: A Warner Communications Company, 1984.

Παραπομπή MLA

Heckel, Paul. Elements Friendly Software Design. A Warner Communications Company, 1984.