this edition written and researched by Oliver Berry [and 12 others]. this edition written and researched by Oliver Berry [and 11 others]. this edition written and researched by Anthony Ham [and 12 others]. this edition written and researched by Oliver Berry ... [et al.] this edition written and reseached by Sara Benson [and 13 others]. this edition written and researched by Sara Benson [and 7 others]. this edition written and researched by Karla Zimmerman [and 7 others]. this edition written and researched by Abigail Blasi [and nine others] this edition written and researched by Amy Balfour [and nine others]. this edition written and researched by Simon Richmond [and 6 others].