APA

Lundquist J. E., Estados Unidos, . (1993). Distribution and causes of canopy gaps in white spruce in the Black Hills. Washington: Intermountain Research Station.

Chicago

Lundquist J E, Estados Unidos, . 1993. Distribution and causes of canopy gaps in white spruce in the Black Hills. Washington: Intermountain Research Station.

Harvard

Lundquist J. E., Estados Unidos, . (1993). Distribution and causes of canopy gaps in white spruce in the Black Hills. Washington: Intermountain Research Station.

MLA

Lundquist J E, Estados Unidos, . Distribution and causes of canopy gaps in white spruce in the Black Hills. Washington: Intermountain Research Station. 1993.