APA

Penn Frances, Black Laurel, . (1977). Developing labor law. Washington, D C: The American Bar Association.

Chicago

Penn Frances, Black Laurel, . 1977. Developing labor law. Washington, D C: The American Bar Association.

Harvard

Penn Frances, Black Laurel, . (1977). Developing labor law. Washington, D C: The American Bar Association.

MLA

Penn Frances, Black Laurel, . Developing labor law. Washington, D C: The American Bar Association. 1977.