Waller, Pip, author
North Atlantic Books, 2010
Buku Teks
College, 2001
Buku Teks
Margareta Nordin, Vuctor H. Frankel, editors
Wolters Kluwer, 2012
Buku Teks
Nanda, Ravindra, author
Elsevier, 2015
Buku Teks
Young, Clarence W., author
Harper & Brothers, 1956
Buku Teks