Perry, James W.
Wadsworth, 1996
Buku Referensi
Roland, Jean-Claude
Little, Brown and Company, 1977
Buku Referensi
Johnson, Willis H.
Holt, Rinehart and Winston, 1961
Buku Teks
Johnson, Willis H.
Holt, Rinehart and Winston, 1961
Buku Teks
Winokur, Morris
Littlefield Adams, 1962
Buku Teks