APA

GRAHAM N., . (1992). LEARNING C. NEW YORK: MCGRAW-HILL.

Chicago

GRAHAM NEILL, . 1992. LEARNING C. NEW YORK: MCGRAW-HILL.

Harvard

GRAHAM N., . (1992). LEARNING C. NEW YORK: MCGRAW-HILL.

MLA

GRAHAM NEILL, . LEARNING C. NEW YORK: MCGRAW-HILL. 1992.