Heidhues, Mary Somers
Thames dan Hudson , 2000
Buku Teks
Osborne, Milton, author
Allen& Unwin , 2000
Buku Teks
Vickers, Adrian, author
Cambridge University Press, 2010
Buku Teks
edited by Johannes Dragsbaek Schmidt, Jacques Hersh; Niels Fold
Longman, , 1997
Buku Teks
Du Bois, Cora Alice, 1903-1991, author
University of Minesota Press, 1949
Buku Teks