(1946). Pruning wound healing on western white and ponderosa pines / by Austin E. Helmers.
Citazione stile Chigago Style (17a edizione)Pruning Wound Healing on Western White and Ponderosa Pines / by Austin E. Helmers. 1946.
Citatione MLA (9a ed.)Pruning Wound Healing on Western White and Ponderosa Pines / by Austin E. Helmers. 1946.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.