Não informado. (1960). Greenhouse, garden, grass. Plant Research Institute, Department of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Greenhouse, Garden, Grass. Ottawa: Plant Research Institute, Department of Agriculture, 1960.
MLA-referens (8:e uppl.)Não informado. Greenhouse, Garden, Grass. Plant Research Institute, Department of Agriculture, 1960.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.