Παραπομπή APA

Zimmermann, M. H. (1971). Trees structure and function. Springer verlag.

Παραπομπή Chicago Style

Zimmermann, Martin H. Trees Structure and Function. Newyork: Springer verlag, 1971.

Παραπομπή MLA

Zimmermann, Martin H. Trees Structure and Function. Springer verlag, 1971.