Não informado. (1971). Journal of Agricultural Research. Government of the Punjab, Department of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Journal of Agricultural Research. Lahore, Paquistao: Government of the Punjab, Department of Agriculture, 1971.
MLA-referens (8:e uppl.)Não informado. Journal of Agricultural Research. Government of the Punjab, Department of Agriculture, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.