Horn, E., & Ashbaugh, E. J. (1970). Progress in Spelling: Grades one to eight. JB Lippincott Company.
Chicago Style (17th ed.) CitationHorn, Ernest, and Ernest J. Ashbaugh. Progress in Spelling: Grades One to Eight. JB Lippincott Company, 1970.
MLA (8th ed.) CitationHorn, Ernest, and Ernest J. Ashbaugh. Progress in Spelling: Grades One to Eight. JB Lippincott Company, 1970.
Warning: These citations may not always be 100% accurate.