Não informado. (1975). Plant Research and Development. Institute for Scientific Co-operation.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Plant Research and Development. Tubingen, Alemanha: Institute for Scientific Co-operation, 1975.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Plant Research and Development. Institute for Scientific Co-operation, 1975.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.