APA

GATENBY E. V., Longmans & Company, . (1957). A Direct Method English Course. london: longmans.

Chicago

GATENBY E V, Longmans & Company, . 1957. A Direct Method English Course. london: longmans.

Harvard

GATENBY E. V., Longmans & Company, . (1957). A Direct Method English Course. london: longmans.

MLA

GATENBY E V, Longmans & Company, . A Direct Method English Course. london: longmans. 1957.