APA (7th ed.) Citation

Nold, R. (1999). Penstemons. Timber Press.

Chicago Style (17th ed.) Citation

Nold, Robert. Penstemons. Portland, Or.: Timber Press, 1999.

MLA (9th ed.) Citation

Nold, Robert. Penstemons. Timber Press, 1999.

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