APA Edition Citation

Koba, S., & Tweed, A. (2017). Hard-to-teach biology concepts: Designing instruction aligned to the NGSS (Rev. 2nd ed.). Viva books.

Chicago Edition Citation

Koba, Susan, and Anne Tweed. Hard-to-teach Biology Concepts: Designing Instruction Aligned to the NGSS. Rev. 2nd ed. New Delhi: Viva books, 2017.

MLA Edition Citation

Koba, Susan, and Anne Tweed. Hard-to-teach Biology Concepts: Designing Instruction Aligned to the NGSS. Rev. 2nd ed. Viva books, 2017.