Millard, Thomas F.
George Allen and Unwin, 1924
Buku Teks
Millard, Thomas F.
ABC Press, 1931
Buku Teks
Dernburg, Thomas F.
McGraw-Hill, 1985
Buku Teks
Gordon, Bernard K., author
Prentice-Hall, 1966
Buku Teks
George, Thomas F
Prentice-Hall, 1987
Buku Teks