APA (7 ম সংস্করণ) উদ্ধৃতি

Langfield, M. (2007). As sete chaves. Civilização.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Langfield, Martin. As Sete Chaves. Civilização, 2007.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Langfield, Martin. As Sete Chaves. Civilização, 2007.