In 2011, Denis Lenfant took part to the writing of a handbook which aim is to offer the readers an overview of the debt collection procedures in Belgium and other foreign countries: Austria, China, France, Germany, Israel, Italy, Japan, Luxembourg, the Netherlands, Poland, Spain, Switzerland, the United-Kingdom and the United States of America. This handbook is realised under the supervision of Marianne Dickstein, lawyer admitted to the Brussel Bar association. The other contributors are : Stéphane Mercier, Julia Blind, Elena Buranova, Lukasz Caban, France Charruyer, Jean-Louis Collart, Tom Custance, James Daughterey, Otto De Witt Wijnen, Michael Doland, Anka Greving, Onur Hukuk, Genta Irie, Denis Lenfant, Bruno Mateu, Sabina Mayer, Michael Meyenburg, Kaoru Takamatsu, Luca Tiberi, Monika Urbanska, Gavin Zhang.