Lombra, Raymond E.
McGraw-Hill, 1980
Buku Teks
International Texbook , 1970
Buku Teks
Gettell, Raymond G.
Appleton-Century-Crofts, 1928
Buku Teks
Kent, Raymond P., author
Richard D. Irwin, INC, 1960
Buku Teks
Kidwell, David S., author
Dryden Press, 1993
Buku Teks