Collins Clear-Type Press, 1960
Buku Referensi
edited by Jess Stein
Dell Publishing, 1962
Buku Referensi
Theodorson, George A
Buku Teks
Segen, Joseph
McGraw-Hill, 2006
Buku Referensi
Theodorson, George A., author
Barnes & Noble Books, 1969
Buku Referensi