W. Leland Northam

title	ISBN-13	year of publica- tion	other author(s)
The English Advantage: Activity Book 1A Bronze	978-0-06-632622-1	1991	Jacqueline Flamm · Richard C. Yorkey
The English Advantage: Activity Book, Level 1B	978-0-06-632708-2	1991	Jacqueline Flamm · Richard C. Yorkey
The English Advantage Level 1: Student's Book	978-0-06-632621-4	1991	Jacqueline Flamm · Richard C. Yorkey
The English Advantage Level 2: Activity Book A	978-0-06-632626-9	1991	Jacqueline Flamm · Richard C. Yorkey
The English Advantage Level 2: Student's Book	978-0-06-632625-2	1991	Jacqueline Flamm · Richard C. Yorkey