Deschler, Lewis
Government Printing Office, 1967
Buku Teks
Robinson, James A, author
The Bobbs-Merrill Company,Inc., 1963
Buku Teks
Burdette, Franklin L., author
Princeton, Princeton University Press
Buku Teks
Findlay, Bruce Allyn, author
Stanford University Press, 1952
Buku Teks
Findlay, Bruce Allyn, author
Stanford University Press, 1959
Buku Teks