Markus, John, 1911-, author
McGraw-Hill, 1980
Buku Referensi
Kelley, Kitty
Granada Publishing, 1978
Buku Teks
Wertheim, W.F. (Willem Frederik), author
W. Van Hoeve, 1964
Buku Teks
Huff, Toby E., 1942-, author
Cambridge University Press, 2003
Buku Teks
Knuvelder, Gerard
L. C. G. Malmberg, 1964
Buku Teks