APA

Lewis H. G. 1., .Direct mail copy that sells!. New Jersey: Prentice-Hall, Inc.

Chicago

Lewis Herschell Gordon 1926-2016, .Direct mail copy that sells!. New Jersey: Prentice-Hall, Inc.

Harvard

Lewis H. G. 1., .Direct mail copy that sells!. New Jersey: Prentice-Hall, Inc.

MLA

Lewis Herschell Gordon 1926-2016, .New Jersey: Prentice-Hall, Inc. .