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 Karla Zimmerman this edition written and researched by Karla Zimmerman. this edition written and researched by Karla Zimmerman, Catherine Le Nevez. this edition written and researched by Beth Kohn, Sarah Benson this edition written and researched by Paul Clammer, Anna Kaminski this edition written and researched by Sara Benson