Não informado. (1964). IBP news. International Council of Scientific Unions, Special Committee for the International Biological Programme.
Chicago-referens (17:e uppl.)Não informado. IBP News. London: International Council of Scientific Unions, Special Committee for the International Biological Programme, 1964.
MLA-referens (8:e uppl.)Não informado. IBP News. International Council of Scientific Unions, Special Committee for the International Biological Programme, 1964.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.