Trivieri, Larry
John Wiley & Sons, 2001
Buku Teks SO
Whitaker, Julian
Prima Health, 1996
Buku Teks SO
Eliopoulos, Charlotte
Jones & Bartlett Learning, 2010
Buku Teks SO
Olsen, Kristen
Chancellor Press, 1994
Buku Teks SO
Page, Linda
Traditional Wisdom, 2000
Buku Teks SO