this edition written and researched by Andrea Schulte-Peevers... [et al.] this edition written and researched by Andrea Schulte-Peevers...[et al.] this edition written and researched by Andrea Schulte-Peevers. this edition written and researched by Andrew Bender...[et al.] this edition written and researched by Andrea Schulte-Peevers this edition written and researched by Andrea Schulte-Peevers and Jenny Walker. this edition written and researched by Korina Miller...[et al.] this edition written and researched by Bradley Mayhew ... [et al.] this edition written and researched by Fiona Davenport... [et al.] this edition written and researched by Korina Miller ...[et al.]