Scheiner, Irwin, author
University of California Press, 1970
Buku Teks
Graf, Tobias P., author
Oxford University Press, 2017
eBooks
Yamamura, Kozo
Harvard University Press, 1974
Buku Teks
Artikel Jurnal
Andrain, Charles F., author
Macmillan, 1995
Buku Teks