Cita APA (7a ed.)

Shigo, A. L. (1994). Tree anatomy. Shigo and Trees Associates.

Cita Chicago Style (17a ed.)

Shigo, Alex L. Tree Anatomy. New Hampshire: Shigo and Trees Associates, 1994.

Cita MLA (8a ed.)

Shigo, Alex L. Tree Anatomy. Shigo and Trees Associates, 1994.