Johnson, Orlen N.
Pearson Prentice Hall, 2007
Buku Teks
Thomson, Evelyn M.
Pearson, 2012
Buku Teks
Hatrick, Carol Dixon
Saunders : Elsevier, cop, 2016
Buku Teks
Bonehill, Jane
BlackWell Publishing, 2007
Buku Referensi
edited by C. Michael Bowers
Academic Press, 2011
Buku Teks