APA Edition Citation

Koba, S., & Tweed, A. (2017). Hard-to-teach biology concepts: Designing instruction aligned to the NGSS (Revised second edition.). Viva Books.

Chicago Edition Citation

Koba, Susan, and Anne Tweed. Hard-to-teach Biology Concepts: Designing Instruction Aligned to the NGSS. Revised second edition. New Delhi: Viva Books, 2017.

MLA Edition Citation

Koba, Susan, and Anne Tweed. Hard-to-teach Biology Concepts: Designing Instruction Aligned to the NGSS. Revised second edition. Viva Books, 2017.

Warning: These citations may not always be 100% accurate.