Owens, Richard N.
Homewood, Ill. Richard D. Irwin, Inc , 1958
Buku Teks
Krooss, Herman Edward, 1912-1975
Prentice-Hall, 1966
Buku Teks
Andrerson, James E.
Addison-Wesley, 1970
Buku Teks
Reagan, Michael D.
Oxford University Press, 1963
Buku Teks
Breyer, Ralph Frederick, 1897-
McGraw-Hill, 1934
Buku Teks