Não informado. (1975). Plant Research and Development. Institute for Scientific Co-operation.
Chicago-referens (17:e uppl.)Não informado. Plant Research and Development. Tubingen, Alemanha: Institute for Scientific Co-operation, 1975.
MLA-referens (8:e uppl.)Não informado. Plant Research and Development. Institute for Scientific Co-operation, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.