Archer, J. S.
Graham & Trotman, 1986
Buku Teks
Zaba, Joseph, author
Gulf Pub. Co, 1970
Buku Referensi
Mayer-Gurr, Alfred
Pitman, 1976
Buku Teks
Berger, Bill D.
Penn Well Books , 1978
Buku Teks
Craft, B. C. (Benjamin Cole), author
Prentice-Hall, 1991
Buku Teks