by Robert Cook ... [et al.] Robert D.Cook ... [et al. by Roberto Serra ... [et al.]. Robert D. Cook ... [et al.]. by Robert M. Johnston ... [et al.]. by Robert U. Ayres ... [et al.]. by Roger S. Haydock ... [et al.] Robert Kegan ... [et al. by Robert C. Pooley ... by Robert J.T. Bell.