APA

hutty r., . (1983). mastering cobol programming. london: macmillan press.

Chicago

hutty r, . 1983. mastering cobol programming. london: macmillan press.

Harvard

hutty r., . (1983). mastering cobol programming. london: macmillan press.

MLA

hutty r, . mastering cobol programming. london: macmillan press. 1983.