by Edwin Mansfield [and others]
Macmillan, 1971
Buku Teks
Husband, William H., author
Richard D. Irwin, 1948, 1955, 1962
Buku Teks
White, Robert W., author
Prentice-Hall, 1996
Buku Teks
Artikel Jurnal
Bright, James R., author
R. D. Irwin , 1964
Buku Teks