Myrdal, Gunnar, 1898-, author
Harper & Brothers , 1944
Buku Teks
Hall, John Oliver, author
American Book Company, 1958
Buku Teks
edited by with an introduction by Sylvestre C. Warkins and Frederic Seitz
Modern Library, 1944
Buku Teks
Patterson, Thomas E., author
McGraw-Hill, 203
Buku Teks
Becker, Carl L. (Carl Lotus), 1873-1945, author
Yale University Press, 1959
Buku Teks