Pudjiwati Sajogyo, author
Gadjah Mada University Press, 1991
Buku Teks
edited by Howard Newby
John Wiley & Sons, 1978
Buku Teks
Halpern, Joel M., author
Prentice-Hall, 1967
Buku Teks
Artikel Jurnal
Fukutake, Tadashi, author
University of Tokyo Press, 1967
Buku Teks