APA (7th ed.) Citation

Armstrong, P. (2010). Hello! Flex 4. Manning Publications.

Chicago Style (17th ed.) Citation

Armstrong, Peter. Hello! Flex 4. Greenwich, Conn: Manning Publications, 2010.

MLA (9th ed.) Citation

Armstrong, Peter. Hello! Flex 4. Manning Publications, 2010.

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