APA (7th ed.) Citation

Snodgrass, E. C., & Snodgrass, L. L. (2006). Green roof plants: A resource and planting guide. Timber Press.

Chicago Style (17th ed.) Citation

Snodgrass, Edmund C., and Lucie L. Snodgrass. Green Roof Plants: A Resource and Planting Guide. Portland, Or.: Timber Press, 2006.

MLA (8th ed.) Citation

Snodgrass, Edmund C., and Lucie L. Snodgrass. Green Roof Plants: A Resource and Planting Guide. Timber Press, 2006.