Hoagland, Henry E.
McGraw-Hill Book Company, Inc., 1947
Buku Teks
Dewing, Arthur Stone
Ronald Press Co, 1953
Buku Teks
Dewing, Arthur Stone
The Ronald Press Company, 1953
Buku Teks
Husband, William H., author
Richard D. Irwin, 1948, 1955, 1962
Buku Teks
Bogen, Jules I.
Alexander Hamilton Institute, 1961
Buku Teks