World Food Programme , 1993
Buku Teks
World Food Programme , 1990
Buku Teks
editor, Rattan Lal, B.A. Stewart
CRC Press, 2012
Buku Teks
by Andrew Schmitz, P. Lynn Kennedy, Troy G. Schmitz
Emerald, 2017
eBooks
edited by Andrew Schmitz, P. Lynn Kennedy, Troy G. Schmitz
Emerald, 2016
eBooks