Cita APA (7th ed.)

Watkins, R. P. (1980). Computer problem solving. Robert E. Krieger.

Cita Chicago (17th ed.)

Watkins, R. P. Computer Problem Solving. Malabar: Robert E. Krieger, 1980.

Cita MLA (9th ed.)

Watkins, R. P. Computer Problem Solving. Robert E. Krieger, 1980.