Não informado. (1955). Commercial fertilizer and plant food industry. W.W. Brown Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Commercial Fertilizer and Plant Food Industry. Atlanta, Ga: W.W. Brown Publishing, 1955.
Lua MLA (8ú heag.)Não informado. Commercial Fertilizer and Plant Food Industry. W.W. Brown Publishing, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.