APA

Clark G. L., Hawley G. G., . (1966). The encyclopedia of chemistry. New York: Van Nostrand Reinhold.

Chicago

Clark George L, Hawley Gessner G, . 1966. The encyclopedia of chemistry. New York: Van Nostrand Reinhold.

Harvard

Clark G. L., Hawley G. G., . (1966). The encyclopedia of chemistry. New York: Van Nostrand Reinhold.

MLA

Clark George L, Hawley Gessner G, . The encyclopedia of chemistry. New York: Van Nostrand Reinhold. 1966.