written and researched by Cristian Bonetto [and9 others written and researched by Cristian Bonetto [and9 others]. written and researched by Cristian Bonetto, Paula Hardy written and researched by Cristian Bonetto... [et al. written and researched by Cristian Bonetto... [et al.] written and researched by Cristian Bonetto and Helena Smith written and researched by Cristian Bonetto and Helena Smith. this edition written and researched by Cristian Bonetto [and nine others this edition written and researched by Cristian Bonetto [and nine others] written and researched by Mara Vorhees [and others].