Todd F. Heatherton, Lynn T. Kozlowski, Richard C. Frecker, Karl-Olov Fagerstrom: The Fagerstrom Test for Nicotine Dependence: a revision of the Fagerstrom Tolerance Questionnaire. In: Addiction. Band86, Nr.9, September 1991, ISSN0965-2140, S.1119–1127, doi:10.1111/j.1360-0443.1991.tb01879.x (wiley.com [abgerufen am 16. Februar 2021]).
Todd F. Heatherton, Lynn T. Kozlowski, Richard C. Frecker, Karl-Olov Fagerstrom: The Fagerstrom Test for Nicotine Dependence: a revision of the Fagerstrom Tolerance Questionnaire. In: Addiction. Band86, Nr.9, September 1991, ISSN0965-2140, S.1119–1127, doi:10.1111/j.1360-0443.1991.tb01879.x (wiley.com [abgerufen am 16. Februar 2021]).
Todd F. Heatherton, Lynn T. Kozlowski, Richard C. Frecker, Karl-Olov Fagerstrom: The Fagerstrom Test for Nicotine Dependence: a revision of the Fagerstrom Tolerance Questionnaire. In: Addiction. Band86, Nr.9, September 1991, ISSN0965-2140, S.1119–1127, doi:10.1111/j.1360-0443.1991.tb01879.x (wiley.com [abgerufen am 16. Februar 2021]).