APA (7th ed.) Citation

Ferguson, N., & O'Reilly, M. English by objectives. Units 1-5 Student's book.

Chicago Style (17th ed.) Citation

Ferguson, Nicolas, and Máire O'Reilly. English by Objectives. Units 1-5 Student's Book.

MLA (8th ed.) Citation

Ferguson, Nicolas, and Máire O'Reilly. English by Objectives. Units 1-5 Student's Book.

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