APA

Ernst G. W., Newell A., . (1969). GPS. New York: Academic Press.

Chicago

Ernst George W, Newell Allen, . 1969. GPS. New York: Academic Press.

Harvard

Ernst G. W., Newell A., . (1969). GPS. New York: Academic Press.

MLA

Ernst George W, Newell Allen, . GPS. New York: Academic Press. 1969.