Determination of para-Phenylenediamine (PPD) in Henna in the United Arab Emirates. [ONLINE] Available at:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2872353/. [Accessed 23 January 2014]
[ONLINE] Available at:http://www.webapps.cee.vt.edu/ewr/environmental/teach/smprimer/icpms/schematic.gif. [Accessed 01 February 2014].
[ONLINE] Available at:http://pioneer.netserv.chula.ac.th/~skitipat/hplc/pic1.gif. [Accessed 02 February 2014].
[ONLINE] Available at:http://people.whitman.edu/~dunnivfm/C_MS_Ebook/CH2/Figures/Fig_2_5_GC-MS.jpg. [Accessed 01 February 2014].
[ONLINE] Available at:https://www2.essex.ac.uk/estates/Documents/Risk%20assessment_preferred%20template.pdf. [Accessed 04 February 2014].
