Serra, A. B. (1938). Secondary circulation of southern Brasil. Serviço de publicações d.a.c..
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিSerra, Adalberto B. Secondary Circulation of Southern Brasil. Rio de Janeiro: Serviço de publicações d.a.c., 1938.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিSerra, Adalberto B. Secondary Circulation of Southern Brasil. Serviço de publicações d.a.c., 1938.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.