APA (7th ed.) Citation

Main, M., & Tittel, E. (2004). HTI+. Que Certification.

Chicago Style (17th ed.) Citation

Main, Max, and Ed Tittel. HTI+. [Indianapolis, Ind.]: Que Certification, 2004.

MLA (8th ed.) Citation

Main, Max, and Ed Tittel. HTI+. Que Certification, 2004.