1. Official methods of analysis of AOAC;AOAC,1990
2. Official methods of analysis of AOAC;AOAC,1995
3. Analysis of vanilla essences by high-performance liquid chromatography;Archer;Journal of Chromatography,1989
4. Code of Federal Regulations. (1987). Title 21, part 169.175. Washington, DC, USA: US Government Printing Office.
5. HPLC-untersuchung von handelsproducten mit vanille oder vanillearoma;Ehlers;Deutsche Lebensmittel – Rundschau,1999