APA

Lay T. H., . (1925). The foreign service of the United States. New York: Prentice-Hall, Inc.

Chicago

Lay Tracy Hollingsworth, . 1925. The foreign service of the United States. New York: Prentice-Hall, Inc.

Harvard

Lay T. H., . (1925). The foreign service of the United States. New York: Prentice-Hall, Inc.

MLA

Lay Tracy Hollingsworth, . The foreign service of the United States. New York: Prentice-Hall, Inc. 1925.