Não informado. (1960). Greenhouse, garden, grass. Plant Research Institute, Department of Agriculture.
Chicago-viite (17. p.)Não informado. Greenhouse, Garden, Grass. Ottawa: Plant Research Institute, Department of Agriculture, 1960.
MLA-viite (8. p.)Não informado. Greenhouse, Garden, Grass. Plant Research Institute, Department of Agriculture, 1960.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.