Lilley , R. (2002). Dealing with Difficult People. Kogan Page Limited.
Citazione stile Chigago Style (17a edizione)Lilley , Roy. Dealing with Difficult People. United kingdom: Kogan Page Limited, 2002.
Citatione MLA (9a ed.)Lilley , Roy. Dealing with Difficult People. Kogan Page Limited, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.