APA

Zamora R., Saito F. & Albrecht B. (1990). The Shareware book: Using PC-Write, PC -File+, and PC-Calc+. New York: Osborne McGram-Hill.

Chicago

Zamora R, Saito F and Albrecht B. 1990. The Shareware book: Using PC-Write, PC -File+, and PC-Calc+. New York: Osborne McGram-Hill.

Harvard

Zamora R., Saito F. and Albrecht B. (1990). The Shareware book: Using PC-Write, PC -File+, and PC-Calc+. New York: Osborne McGram-Hill.

MLA

Zamora R, Saito F and Albrecht B. The Shareware book: Using PC-Write, PC -File+, and PC-Calc+. New York: Osborne McGram-Hill. 1990.