Gaya APA

Grey, J, O, J, P, P, T, &, M. (2007). Public Health for the 21st Century . New York: Mc Graw Hill.

Gaya MLA

Grey, Judy, Orme,, Jane, Powell,, Pat, Taylor, &, Melanie. "Public Health for the 21st Century". New York: Mc Graw Hill, 2007. Ebook.