International Seed Testing Association. (1990). Amendments to the international rules for seed testing 1985: As agreed on by the 22nd ISTA Congress in Edinburgh, July 1989 valid July 1st, 1987 : see also the amendments from the ISTA Congress 1986, valid since July 1st, 1987. Zurich: The International Seed Testing Association.
Citación estilo ChicagoInternational Seed Testing Association. Amendments to the International Rules for Seed Testing 1985: As Agreed On By the 22nd ISTA Congress in Edinburgh, July 1989 Valid July 1st, 1987 : See Also the Amendments From the ISTA Congress 1986, Valid Since July 1st, 1987. Zurich: The International Seed Testing Association, 1990.
Cita MLAInternational Seed Testing Association. Amendments to the International Rules for Seed Testing 1985: As Agreed On By the 22nd ISTA Congress in Edinburgh, July 1989 Valid July 1st, 1987 : See Also the Amendments From the ISTA Congress 1986, Valid Since July 1st, 1987. Zurich: The International Seed Testing Association, 1990.