Handlin, Mary Flug
Harvard University Press, 1969
Buku Teks
Handlin, David p
Thames And Hudson, 1985
Buku Teks
M.I.T. Press and Harvard University, 1963
Buku Teks
Thelen, David P.
Little, Brown and Company, 1976
Buku Teks
Johnson, Rossal James
Richard D. Irwin, 1960
Buku Teks