Gulf Publishing Company, 1976
Buku Teks
Levorsen, A.I.
San Fransisco: W.H. Freeman, 1967
Buku Teks
London: Tiger Books International, 1994,
Buku Referensi
Uren, Lester C.
New York: McGraw-Hill, 1950
Buku Teks
Uren, Lester C.
New York: McGraw-Hill, 1950
Buku Teks