Walz, Jay
Atheneum, 1966
Buku Teks
Walker, Allan S.
Australian War Memorial, 1956
Buku Teks
Jack M. Sasson, Johan Baines, Gary Beckman, Karen S. Rubinson, editor
Charles Scribner's Sons, 1995
Buku Referensi
edited by Jack M. Sasson
Simon & Schuster, 1995
Buku Teks
Palmer, Monte
Thomson Wadsworth, 2007
Buku Teks