APA (7th ed.) Citation

Koba, S., & Tweed, A. (2009). Hard-to-teach biology concepts: A framework to deepen student understanding. NSTA Press.

Chicago Style (17th ed.) Citation

Koba, Susan, and Anne Tweed. Hard-to-teach Biology Concepts: A Framework to Deepen Student Understanding. Arlington, Va.: NSTA Press, 2009.

MLA (9th ed.) Citation

Koba, Susan, and Anne Tweed. Hard-to-teach Biology Concepts: A Framework to Deepen Student Understanding. NSTA Press, 2009.