APA (7 ম সংস্করণ) উদ্ধৃতি

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

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

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