Coba jelasin Catatan dari Susanne Langer dong

Campbell, James. "Langer's Understanding of Philosophy." Transactions Of The Charles S. Peirce Society 33.1 (1997): 133. Academic Search Complete. Web. 14 Mar. 2016.

Lyon, Arabella . “Susanne Langer.” Notable American Women. Cambridge: Belknap Press of Harvard University. 2005. 36

Connie C. Price. "Langer, Susanne K." American National Biography Online Feb. 2000. Accessed March 14, 2016. 2000 American Council of Learned Societies. Published by Oxford University Press.