Grampp, William D.
Richard D. Irwin , 1953
Buku Teks
Reagan, Michael D., author
Oxford University Press, 1963
Buku Teks
Andrerson, James E., author
Addison-Wesley, 1970
Buku Teks
Schiller, Bradley R., author
Prentica-Hall , 1975
Buku Teks
Hansen, Alvin H. (Alvin Harvey), 1887-1975, author
MacGraw-Hill , 1947
Buku Teks