Howard, E. W. (1969). Chemicals from nature. Published for the Nuffield Foundation by the Longmans/Penguin Books.
Chicago-referens (17:e uppl.)Howard, E. W. Chemicals from Nature. London: Published for the Nuffield Foundation by the Longmans/Penguin Books, 1969.
MLA-referens (9:e uppl.)Howard, E. W. Chemicals from Nature. Published for the Nuffield Foundation by the Longmans/Penguin Books, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.