APA استشهاد

Halka, M., & Nordstrom, B. (2010). Nonmetals. Facts on File.

استشهاد بنمط شيكاغو

Halka, Monica, و Brian Nordstrom. Nonmetals. New York, NY: Facts on File, 2010.

MLA استشهاد

Halka, Monica, و Brian Nordstrom. Nonmetals. Facts on File, 2010.