Cashman, Thomas J., author
Anaheim Publishing, 1970
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1966
Buku Teks
O`Brien, James A., 1936-, author
Richard D. Iriwin, 1986
Buku Referensi
Gildersleeve, Thomas R., author
Prentice-Hall, 1971
Buku Teks
edited by I.H. Gould
North-Holland , 1971
Buku Teks