Ballou, H. W. (1959). Guide to microreproduction equipment. National Microfilm Association.
Cita Chicago (17th ed.)Ballou, Hubbard W. Guide to Microreproduction Equipment. Annapolis, Md: National Microfilm Association, 1959.
Cita MLA (9th ed.)Ballou, Hubbard W. Guide to Microreproduction Equipment. National Microfilm Association, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.