Babette Moeller [et al.]. Martin Fowler [et al.]. Philip Kotler [et al.]. Wayne M. Becker [et al.]. David F. Groebner [et al.]. Robert F. Bruner [et al.]. Carl Hamacher [et al.]. Pieter Harpe [et al.]. R.R. Palmer [et al.]. Woellner [et al.]