Books, Brochures, and Chapters>Book:  Owen, Sir Richard (1859), President's Address to the British Association, Leeds (1858), Yearbook of Facts in Science and Art, Retrieved on 2012-06-09

Source Material [books.google.com]

Periodicals>Journal Article:  Owen, Sir Richard (1858), On the Characters, Principles of Division, and Primary Groups of the Class MAMMALIA, Journal of the Proceedings of the Linnean Society of London , (1858), 2, 19-20. , Retrieved on 2012-06-09