APA
(1957). Workbook in Spanish Two Years. New York: AMSCO School Publications ,Inc.
Chicago
1957. Workbook in Spanish Two Years. New York: AMSCO School Publications ,Inc.
Harvard
(1957). Workbook in Spanish Two Years. New York: AMSCO School Publications ,Inc.
MLA
Workbook in Spanish Two Years. New York: AMSCO School Publications ,Inc. 1957.