APA

Stahl E. G., Persson B. & Prescher F. (1990). Effect of provenance and spacing on stem straightness and number of stems with spike knots in Pinus sylvestris L. -Northern Sweden and countrywide models. Uppsala: Swedish University of Agricultural Sciences.

Chicago

Stahl Erik G, Persson Bengt and Prescher Finnvid. 1990. Effect of provenance and spacing on stem straightness and number of stems with spike knots in Pinus sylvestris L. -Northern Sweden and countrywide models. Uppsala: Swedish University of Agricultural Sciences.

Harvard

Stahl E. G., Persson B. and Prescher F. (1990). Effect of provenance and spacing on stem straightness and number of stems with spike knots in Pinus sylvestris L. -Northern Sweden and countrywide models. Uppsala: Swedish University of Agricultural Sciences.

MLA

Stahl Erik G, Persson Bengt and Prescher Finnvid. Effect of provenance and spacing on stem straightness and number of stems with spike knots in Pinus sylvestris L. -Northern Sweden and countrywide models. Uppsala: Swedish University of Agricultural Sciences. 1990.