APA (7th ed.) Citation

(2001). Blue skies workbook: 1. LongmanI.

Chicago Style (17th ed.) Citation

Blue Skies Workbook: 1. England: LongmanI, 2001.

MLA (9th ed.) Citation

Blue Skies Workbook: 1. LongmanI, 2001.

Warning: These citations may not always be 100% accurate.