Pasricha, Neil, author
G.P. Putnam's Sons, an imprint of Penguin Random House LLC, 2016
Buku Teks
Spendolini, Michael J.
New York : Amacom 1992 , 1992
Buku Teks
marino, Paul L, author
Lippincott Williams & Wilkins, 2007
Buku Teks
Miller, William, author
New York: Columbia University, 1949
Buku Teks
Willis, Connie
Bantam Books, 1992
Buku Teks