Παραπομπή σε μορφή APA (7η εκδ.)

Howard, E. W. (1969). Chemicals from nature. Published for the Nuffield Foundation by the Longmans/Penguin Books.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Howard, E. W. Chemicals from Nature. London: Published for the Nuffield Foundation by the Longmans/Penguin Books, 1969.

Παραπομπή σε μορφή MLA (9th εκδ.)

Howard, E. W. Chemicals from Nature. Published for the Nuffield Foundation by the Longmans/Penguin Books, 1969.