Foulkes, David, 1924-, author
Butterworth, 1990
Buku Teks
Robinson, Glen O., author
West Publishing, 1986
Buku Teks
Robinson, Glen O., author
West Publishing, 1974
Buku Teks
Marvin, Philip Roger, author
Research Press, 1954
Buku Teks
Pfifner, John M., author
Prentice-Hall, 1960
Buku Teks