“…These selection criteria were derived from the literature (La Londe and Maltz, 1992; van Laarhoven and Sharman, 1994; Maltz, 1995; Sink et al , 1996; van Damme and Ploos van Amstel, 1996; Crum and Allen, 1997; Sink and Langley, 1997; Logistics and Transport Focus, 2000; Aktas and Ulengin, 2005; Göl and Çatay, 2007; Wanke et al , 2008; Gotzamani et al , 2010; Aktas et al , 2011; Wolf and Seuring, 2010; Aguezzoul, 2014 and the references she cites, Govindan et al , 2016; Hwang et al , 2016) and evaluated and adapted to Germany by four experts from LSPs, four from manufacturing companies and three from trading companies. For instance, the criterion employment of subcontractors or contract workers was included.…”