edited by Robert W. Tucker, Charles B. Keely and Linda Wrigley
Westview Press, 1992
Buku Teks SO
Department of the Army Field Manual
Dorset Press, 2000
Buku Teks
Artikel Jurnal
Artikel Jurnal
by Deepa Narayan ... [et al.]
Oxford University Press, 2000
Buku Teks