McNeill, Patrick
Routledge, 1990
Buku Teks
White, Theresa L.
Wadsworth and Cengage Learning, 2013
Buku Teks
McNeill, Patrick
Routledge, 1999
Buku Teks
Paterson, John
John Wiley & Sons, 1977
Buku Teks
Wass, Alonzo
Reston, VA: Reston Publishing, 1973
Buku Teks