D.C. U.S. Department of Labor , 1957
Buku Teks
Prentice-Hall, 1967
Buku Teks
Madley, Benjamin, author
Yale University Press, 2016
Buku Teks
edited by A. James Casner
Little, Brown, 1952
Buku Teks
Odum, Howard W., author
Longmans Green, 1951
Buku Teks