APA (7th ed.) Citation

Heimpel, W. (2011). Twenty-Eight Trees Growing in Sumer.

Chicago Style (17th ed.) Citation

Heimpel, Wolfgang. Twenty-Eight Trees Growing in Sumer. 2011.

MLA (8th ed.) Citation

Heimpel, Wolfgang. Twenty-Eight Trees Growing in Sumer. 2011.

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