Sheffield, Linda Jensen
John Wiley & Sons, 2000
Buku Teks
May, Lola June
The Free Press, 1970
Buku Teks
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks
Garstens, Helen L., author
Macmillan, 1969
Buku Teks
Beckmann, Sybilla, author
Pearson Addison Wesley, 2008
Buku Teks