Walker, Warren F.
Saunders College Pub., 1986
Buku Referensi
Walker, Warren F.
Saunders College, 1980
Buku Teks
Wischnitzer, Saul
W.H. Freeman, 1972
Buku Teks
Walker, Warren F.
W.B. Saunders, 1975
Buku Teks
Anne Marie Coady, Sarah Bower, editors
Churchill Livingstone, 2015
Buku Teks