Citação norma APA

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

Citação norma Chicago

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.

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.