APA (7th ed.) Citation

Butler, S. (2006). WHO IS AN AUTHOR? Billboard, 118(32), 28.

Chicago Style (17th ed.) Citation

Butler, Susan. "WHO IS AN AUTHOR?" Billboard 118, no. 32 (2006): 28.

MLA (9th ed.) Citation

Butler, Susan. "WHO IS AN AUTHOR?" Billboard, vol. 118, no. 32, 2006, p. 28.