May, Lola June
Free Press, 1970
Buku Teks SO
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks SO
Garstens, Helen L.
Macmillan, 1969
Buku Teks SO
Beckmann, Sybilla
Pearson Addison Wesley, 2008
Buku Teks SO
Musser, Gary L.
John Wiley & Sons, 2006
Buku Teks SO