APA (7th ed.) Citation

Gunkel, W. (2011). Handbook of essential oils. Alkem Co.

Chicago Style (17th ed.) Citation

Gunkel, W. Handbook of Essential Oils. Singapore: Alkem Co, 2011.

MLA (9th ed.) Citation

Gunkel, W. Handbook of Essential Oils. Alkem Co, 2011.

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