edited by Jean V. Craig and Rosalind L. Smyth
Elsevier; Churchill Livingstone, 2012
Buku Teks SO
Rubin, Allen
John Wiley & Sons, 2012
Buku Teks SO
Leger, A.S. St.
Open UNiversity Press, 1999
Buku Teks
Brown, Brian
Open University Press, 2003
Buku Teks
Rusaw, A. Carol
Harcourt College Publishers, 2001
Buku Referensi