Danilov, Victor J. author
Macmillan, 1955
Buku Teks
Randall, David, author
Pluto Press, 2007
Buku Teks
Mac Dangall, Curtis D., author
Macmillan, 1967
Buku Teks
Izard, Halph S., author
Hunt Publishing Company, 1977
Buku Teks
Rucker, Bryce W., author
The Iowa State Univ. Press, 1964
Buku Teks