this edition written and researched by Karla Zimmerman, Catherine Le Nevez. this edition written and researched by Karla Zimmerman, Sara Benson this edition written and researched by Karla Zimmerman ... [et al. this edition written and researched by Karla Zimmerman ... [et al.]. this edition written and researched by Karla Zimmerman...[et al. this edition written and researched by Catherine Le Nevez this edition written and researched by Karla Zimmerman, Amy Balfour & Nate Cavalieri. this edition written and researched by Karla Zimmerman. this edition written and researched by Karla Zimmerman this edition written and researched by Neil Wilson [and nine others