Hall, R.P.
Blaisdell Publishing, 1964
Buku Teks
Wilson, Eva, 1925-, author
John Wiley & Sons, 1967
Buku Teks
Booth, David, author
Taylor and Francis, 1994
Buku Teks
Arlin, Marian Thompson
Buku Teks
Whitney, Ellie, author
Wadsworth and Cengage Learning, 2013
Buku Teks