Dodd, Walter Fairleigh, 1880-1960, author
Century, 1923
Buku Teks
Field, Oliver P
Harper, 1949
Buku Teks
Holloway, William Vernon, author
McGraw-Hill , 1951
Buku Teks
edited by Herbert L. Marx
H.W. Wilson, 1962
Buku Teks
Cox, George, author
Thomson Learning, 2001
Buku Teks