"Preferential treatment to businesses that offer gratuities may lead to an environment conducive to police corruption." Chambliss، William J (2011). Police and Law Enforcement. Key Issues in Crime & Punishment Series. SAGE. ص. 130. ISBN:9781412978590. مؤرشف من الأصل في 2022-02-26. اطلع عليه بتاريخ 2020-10-05.
"Most police officers draw the line between accepting gratuities without 'strings' and taking bribes to compromise their policing duties, but gratuities can influence police to spend their time unequally among establishments that do and do not offer them gratuities." Feldberg، M (1985)، "Gratuities, Corruption, and the Democratic Ethos of Policing The Case of the Free Cup of Coffee"، Moral Issues in Police Work، ص. 267–268، مؤرشف من الأصل في 2015-07-14، اطلع عليه بتاريخ 2015-04-19
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Ivković، Sanja Kutnjak؛ Klockars، Carl؛ Cajner‐Mraović، Irena؛ Ivanušec، Dražen (2002). "Controlling Police Corruption: The Croatian Perspective". Police Practice and Research. ج. 3: 55–72. DOI:10.1080/15614260290011336. S2CID:144690458.
"...the acceptance of gratuities and the like presents a bad image of the officers and the agency to the public. Citizens who witness or learn of officers receiving special treatment or gratuities can understandably feel a degree of resentment toward not only the officers involved but the police agency as a whole." IACP Model Policy on Standards of Conduct، Alexandria, VA: International Association of Chiefs of Police، 1998، مؤرشف من الأصل في 2015-04-30، اطلع عليه بتاريخ 2015-04-19
"H-Net Reviews". h-net.org. 13 نوفمبر 1997. مؤرشف من الأصل في 2012-10-17. اطلع عليه بتاريخ 2010-02-06.
"Preferential treatment to businesses that offer gratuities may lead to an environment conducive to police corruption." Chambliss، William J (2011). Police and Law Enforcement. Key Issues in Crime & Punishment Series. SAGE. ص. 130. ISBN:9781412978590. مؤرشف من الأصل في 2022-02-26. اطلع عليه بتاريخ 2020-10-05.
"...the acceptance of gratuities and the like presents a bad image of the officers and the agency to the public. Citizens who witness or learn of officers receiving special treatment or gratuities can understandably feel a degree of resentment toward not only the officers involved but the police agency as a whole." IACP Model Policy on Standards of Conduct، Alexandria, VA: International Association of Chiefs of Police، 1998، مؤرشف من الأصل في 2015-04-30، اطلع عليه بتاريخ 2015-04-19
"Most police officers draw the line between accepting gratuities without 'strings' and taking bribes to compromise their policing duties, but gratuities can influence police to spend their time unequally among establishments that do and do not offer them gratuities." Feldberg، M (1985)، "Gratuities, Corruption, and the Democratic Ethos of Policing The Case of the Free Cup of Coffee"، Moral Issues in Police Work، ص. 267–268، مؤرشف من الأصل في 2015-07-14، اطلع عليه بتاريخ 2015-04-19
