APA

Black P. B., . (1989). On the use of the Fi-variable to describe the state of water in porous media. Hanover, NH: Cold Regions Research & Engineering Laboratory.

Chicago

Black Patrick B, . 1989. On the use of the Fi-variable to describe the state of water in porous media. Hanover, NH: Cold Regions Research & Engineering Laboratory.

Harvard

Black P. B., . (1989). On the use of the Fi-variable to describe the state of water in porous media. Hanover, NH: Cold Regions Research & Engineering Laboratory.

MLA

Black Patrick B, . On the use of the Fi-variable to describe the state of water in porous media. Hanover, NH: Cold Regions Research & Engineering Laboratory. 1989.