Gunkel, W. (2011). Handbook of essential oils. Alkem Co.
Chicago Style (17th ed.) CitationGunkel, W. Handbook of Essential Oils. Singapore: Alkem Co, 2011.
MLA (9th ed.) CitationGunkel, W. Handbook of Essential Oils. Alkem Co, 2011.
Warning: These citations may not always be 100% accurate.