Mellion, Morris B., author
Hanley & Belfus, 1994
Buku Teks
Penderghast, Thomas F.
Harcourt Brace Jovanovich, 1988
Buku Teks
Hunter, George E.
WB. Saunders, 1960
Buku Teks
Gleason, Marion N.
The Williams & Willkins, 1969
Buku Teks
Kenchington. R A
Unesco, 1984
Buku Teks