Gaya APA

Dempsey, M, W. (1987). The illustrated encyclopedia of invention growing up with science 21: volcano - welding . New York: Websters Unified H.S. Stuttman Inc..

Gaya MLA

Dempsey, Michael, W.. "The illustrated encyclopedia of invention growing up with science 21: volcano - welding". New York: Websters Unified H.S. Stuttman Inc., 1987. Text.