APA (7th ed.) Citation

Gray, T., Beattie, J., & Collins, W. The poetical works of Gray, Beattie and Collins.

Chicago Style (17th ed.) Citation

Gray, Thomas, James Beattie, and William Collins. The Poetical Works of Gray, Beattie and Collins.

MLA (8th ed.) Citation

Gray, Thomas, et al. The Poetical Works of Gray, Beattie and Collins.