Christie, Agatha. The Mousetrap. 1960. Chicago, Print: Random House
Jung, C.G. The Undiscovered Self. New American Library, 1958.
Attenborough, David. "Vision of Earth." National Geographic, Oct. 2015, pp. 169–84.
the first and the third are good cited works. first comes
author>book name> year of publishing> publisher> pages>when cited in your paper(only for internet sources)