APA (7 ম সংস্করণ) উদ্ধৃতি

Gray, E., & O'Sullivan, N. (2003). Practice Tests for the PET 1 Preliminary English Test: Student's Book. Express Publishing.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Gray, Elisabeth, এবং Neil O'Sullivan. Practice Tests for the PET 1 Preliminary English Test: Student's Book. Newbury: Express Publishing, 2003.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Gray, Elisabeth, এবং Neil O'Sullivan. Practice Tests for the PET 1 Preliminary English Test: Student's Book. Express Publishing, 2003.