Schoenbeck, Robert J., author
Macmillan, 1992
Buku Teks
Woodruff, L.F., author
Wiley Eastern, 1938
Buku Teks
Still, Alfred, author
McGraw-Hill, 1927
Buku Teks
Griffith, B. Whitfield, author
McGraw-Hill, 1962
Buku Teks
Green, D.C., author
Longman, 1995
Buku Teks