APA (7 ম সংস্করণ) উদ্ধৃতি

Roos, G. (1935). Comparative researches on the variation of the constituents of coal of one seam from south Limburg: The Netherlands. Van Aelst Bros.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Roos, Gerrit. Comparative Researches on the Variation of the Constituents of Coal of One Seam from South Limburg: The Netherlands. Maastricht: Van Aelst Bros, 1935.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Roos, Gerrit. Comparative Researches on the Variation of the Constituents of Coal of One Seam from South Limburg: The Netherlands. Van Aelst Bros, 1935.