van Amsterdam, Jan; Sleijffers, Annemarie; van Spiegel, Paul; Blom, Roos; Witte, Maarten; van de Kassteele, Jan; Blokland, Marco; Steerenberg, Peter; Opperhuizen, Antoon (December 2011). "Effect of ammonia in cigarette tobacco on nicotine absorption in human smokers". Food and Chemical Toxicology. 49 (12): 3025–3030. doi:10.1016/j.fct.2011.09.037. ISSN1873-6351. PMID22001171.
van Amsterdam, Jan; Sleijffers, Annemarie; van Spiegel, Paul; Blom, Roos; Witte, Maarten; van de Kassteele, Jan; Blokland, Marco; Steerenberg, Peter; Opperhuizen, Antoon (December 2011). "Effect of ammonia in cigarette tobacco on nicotine absorption in human smokers". Food and Chemical Toxicology. 49 (12): 3025–3030. doi:10.1016/j.fct.2011.09.037. ISSN1873-6351. PMID22001171.
van Amsterdam, Jan; Sleijffers, Annemarie; van Spiegel, Paul; Blom, Roos; Witte, Maarten; van de Kassteele, Jan; Blokland, Marco; Steerenberg, Peter; Opperhuizen, Antoon (December 2011). "Effect of ammonia in cigarette tobacco on nicotine absorption in human smokers". Food and Chemical Toxicology. 49 (12): 3025–3030. doi:10.1016/j.fct.2011.09.037. ISSN1873-6351. PMID22001171.