Tohutoro APA (7th ed.)

BONNO, J. A. (1982). Introduction to COBOL. Business Publications.

Tohutoru Kātū Chicago (17th ed.)

BONNO, John A. Introduction to COBOL. Plano, Tex.: Business Publications, 1982.

Tohutoro MLA (9th ed.)

BONNO, John A. Introduction to COBOL. Business Publications, 1982.