Παραπομπή APA

Costello, L. (2003). Training young trees for structure and form. California: International Society of Arboriculture.

Παραπομπή Chicago Style

Costello, Larry. Training Young Trees for Structure and Form. California: International Society of Arboriculture, 2003.

Παραπομπή MLA

Costello, Larry. Training Young Trees for Structure and Form. California: International Society of Arboriculture, 2003.

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