Killough, Larry N.
Dickenson Publishing, 1977
Buku Teks
Carsberg, B.V.
Prentice Hall International, 1984
Buku Teks
Carsberg, B.V.
Prentice Hall International, 1984
Buku Teks
Usry, Milton F.
South Western, 1988
Buku Teks
Pacsy, Vivian A.
McGraw-Hill, 1986
Buku Teks