APA (7th ed.) Citation

Gray, E., & O'Sullivan, N. Practice Tests for the PET 1 Preliminary English Test: Class CDs. Express Publishing.

Chicago Style (17th ed.) Citation

Gray, Elisabeth, and Neil O'Sullivan. Practice Tests for the PET 1 Preliminary English Test: Class CDs. Newbury: Express Publishing.

MLA (8th ed.) Citation

Gray, Elisabeth, and Neil O'Sullivan. Practice Tests for the PET 1 Preliminary English Test: Class CDs. Express Publishing.

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