Hamblin, Dora Jane
Time-Life International, 1975
Buku Teks
Janson, H.W.
Prentice-Hall, 1966
Buku Referensi
edited by Marc-David L. Seidel, Henrich R. Greve
Emerald, 2017
eBooks
Hamblin, A. C.
McGraw-Hill , 1974
Buku Teks
Goldstein, Dora B.
Oxford University Press, 1983
Buku Teks