APA (7th ed.) Citation

Smith, R. (2010). R+L exercises: American English pronunciation. Rachel's English.

Chicago Style (17th ed.) Citation

Smith, Rachel. R+L Exercises: American English Pronunciation. Philadelphia, PA: Rachel's English, 2010.

MLA (9th ed.) Citation

Smith, Rachel. R+L Exercises: American English Pronunciation. Rachel's English, 2010.

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