Gaya APA

Guth, H, P., Schuster, E, H. (1970). American English today : the tools of English 9 . New York: McGraw-Hill Book Co.,.

Gaya MLA

Guth, Hans, P.., Schuster, Edgar, H.. "American English today : the tools of English 9". New York: McGraw-Hill Book Co.,, 1970. Text.