Benedict, Ruth, author
The Viking Press, 1947
Buku Teks
Ethridge, Marcus E., author
Wadsworth, 2010
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1960
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1954
Buku Teks
Kelsen, Hans, author
University of California Press, 1957
Buku Teks