APA-čujuhus (7. p.)

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

Chicago-čujuhus (17. p.)

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

MLA-čujuhus (9. p.)

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

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