APA

Heilman P. E., Anderson H. W. & Baumgartner D. M. (1979). Forest soils of the douglas-fir region. Washington: Washington State University.

Chicago

Heilman Paul E, Anderson Harry W and Baumgartner David M. 1979. Forest soils of the douglas-fir region. Washington: Washington State University.

Harvard

Heilman P. E., Anderson H. W. and Baumgartner D. M. (1979). Forest soils of the douglas-fir region. Washington: Washington State University.

MLA

Heilman Paul E, Anderson Harry W and Baumgartner David M. Forest soils of the douglas-fir region. Washington: Washington State University. 1979.