Herskovits, Melville J. (Melville Jean), 1895-1963, author
Alfred A. Knopf, 1967
Buku Teks
Thorndike, Edward Lee
Harvard University Press, 1943
Buku Teks
Taylor, A.E. (Alfred Edward), 1869-1945, author
University Paperbacks, 1960
Buku Teks
Smith, Homer William, 1895-1962, author
Thirty Bedford Square, 1953
Buku Teks
Bauer, Raymond A., author
Harvard University Press, 1952; 1959
Buku Teks