APA

Gray L., Graham I., . (2012). Memo, Bd. 65. : .

Chicago

Gray Leon, Graham Ian, . 2012. Memo, Bd. 65. : .

Harvard

Gray L., Graham I., . (2012). Memo, Bd. 65. : .

MLA

Gray Leon, Graham Ian, . Memo, Bd. 65. : . 2012.