edited by A.D. Boardman
John Wiley & Sons, 1980
Buku Teks
Krom, N.J., author
Gian Publishing House, 1986
Buku Referensi
edited by Wolfgang Kollmann
McGraw-Hill, 1980
Buku Teks
Darrow, Ken, author
Volunteers in Asia, 1981
Buku Teks
Abraham, Raimund, 1933-2010, author
Springer Wien, 1996
Buku Teks