written and researched by Cristian Bonetto, Paula Hardy written and researched by Cristian Bonetto [and9 others]. written and researched by Cristian Bonetto... [et al.] this edition written and researched by Cristian Bonetto, Paula Hardy. written and researched by Cristian Bonetto and Helena Smith written & researched by Cristian Bonetto... [ea al.] written and researched by Cristian Bonetto and Helena Smith. written and researched by Carolyn Bain, Cristian Bonetto, Andrew Stone. written and researched by Austin Bush written and researched by Austin Bush.