APA (7th ed.) Citation

DiLeo, C., & Cooper, P. (2020). Beginning Ruby 3: From Beginner to Pro (4th edition.). Apress.

Chicago Style (17th ed.) Citation

DiLeo, Carleton, and Peter Cooper. Beginning Ruby 3: From Beginner to Pro. 4th edition. Apress, 2020.

MLA (9th ed.) Citation

DiLeo, Carleton, and Peter Cooper. Beginning Ruby 3: From Beginner to Pro. 4th edition. Apress, 2020.

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