APA (7 ম সংস্করণ) উদ্ধৃতি

Sahlén, K. (1992). Anatomical and physiological ripening of Pinus sylvestris L. seeds in northern Fennoscandia. Dept. of Silviculture, Swedish University of Agricultural Sciences.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Sahlén, Kenneth. Anatomical and Physiological Ripening of Pinus Sylvestris L. Seeds in Northern Fennoscandia. Umeå, Sweden: Dept. of Silviculture, Swedish University of Agricultural Sciences, 1992.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Sahlén, Kenneth. Anatomical and Physiological Ripening of Pinus Sylvestris L. Seeds in Northern Fennoscandia. Dept. of Silviculture, Swedish University of Agricultural Sciences, 1992.