Não informado. (1955). Commercial fertilizer and plant food industry. W.W. Brown Publishing.
Chicago-referens (17:e uppl.)Não informado. Commercial Fertilizer and Plant Food Industry. Atlanta, Ga: W.W. Brown Publishing, 1955.
MLA-referens (8:e uppl.)Não informado. Commercial Fertilizer and Plant Food Industry. W.W. Brown Publishing, 1955.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.