APA

Stern N., Stern R. A., . (1980). Structured COBOL Programming. New York: John Wiley & Sons.

Chicago

Stern Nancy, Stern Robert A, . 1980. Structured COBOL Programming. New York: John Wiley & Sons.

Harvard

Stern N., Stern R. A., . (1980). Structured COBOL Programming. New York: John Wiley & Sons.

MLA

Stern Nancy, Stern Robert A, . Structured COBOL Programming. New York: John Wiley & Sons. 1980.