APA

Daniel T. W., Helms J. A. & Baker F. S. (1979). Principles of silviculture. New York: McGraw Hill.

Chicago

Daniel Theodore W, Helms John A and Baker Frederick S. 1979. Principles of silviculture. New York: McGraw Hill.

Harvard

Daniel T. W., Helms J. A. and Baker F. S. (1979). Principles of silviculture. New York: McGraw Hill.

MLA

Daniel Theodore W, Helms John A and Baker Frederick S. Principles of silviculture. New York: McGraw Hill. 1979.