APA (7th ed.) Citation

Armstrong, P. (2010). Hello! Flex 4 (1st edition.). Manning.

Chicago Style (17th ed.) Citation

Armstrong, Peter. Hello! Flex 4. 1st edition. Greenwich, Connecticut: Manning, 2010.

MLA (9th ed.) Citation

Armstrong, Peter. Hello! Flex 4. 1st edition. Manning, 2010.

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