Pelto, Gretel H.
Macmillan, 1979
Buku Teks
Majumdar, D.N.
Asia Publishing House, 1960
Buku Teks
Spancer, J.E., author
John Wiley & Sons, 1973
Buku Teks
Spencer, J.E., author
John Wiley & Sons, 1978
Buku Teks
Pouwer, Jan, author
KITLV Press, 2010
Buku Teks