Zastrow, Charles, author
Buku Teks
Gore, M.S., author
Asia Publishing House, 1965
Buku Teks
Friedlander, Walter A., author
prentice Hall of India, 1974
Buku Teks
Friedlander, Walter A., author
Prentice-Hall, 1980
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1986
Buku Teks