Many classes at the AFLCR use a set of standard textbooks to guide study. This is the information you will need to buy these materials on your own.
Beginner Level
Latitudes 1
Covers levels A1 101 through A2 101. The complete set includes both a book and a workbook.
Book ISBN: 978-2-278-06249-2
Workbook ISBN: 978-2-278-06263-8
Elementary Level
Latitudes 2
Covers levels A2 102 through B1. The complete set includes both a book and a workbook.
Book ISBN: 978-2-278-06250-8
Workbook ISBN: 978-2-278-06266-9