APA (7 ম সংস্করণ) উদ্ধৃতি

Gregory, R. (2004). Squaring the circle: 30 St Mary Axe, London : Architekten: Foster and Partners / Bennett Interior Design. The Architectural Review.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Gregory, Rob. "Squaring the Circle: 30 St Mary Axe, London : Architekten: Foster and Partners / Bennett Interior Design." The Architectural Review 2004.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Gregory, Rob. "Squaring the Circle: 30 St Mary Axe, London : Architekten: Foster and Partners / Bennett Interior Design." The Architectural Review, 2004.