Rippy, J. Fred, author
University of Michigan Press, 1958
Buku Teks
edited by Philip M. Hauser
Unesco, 1961
Buku Teks
edited by Werner Baer and Isaac Kerstenetzky
Richard D. Irwin, 1964
Buku Teks
Schlesinger, Arthur M, author
Hougton Mifflin, 1959
Buku Teks
Buku Teks