APA

Hawksworth F. G., Wiens D., . (1972). Biology and classification of dwarf mistletoes (arceuthobium). Washington D. C: Forest Service.

Chicago

Hawksworth Frank G, Wiens Delbert, . 1972. Biology and classification of dwarf mistletoes (arceuthobium). Washington D. C: Forest Service.

Harvard

Hawksworth F. G., Wiens D., . (1972). Biology and classification of dwarf mistletoes (arceuthobium). Washington D. C: Forest Service.

MLA

Hawksworth Frank G, Wiens Delbert, . Biology and classification of dwarf mistletoes (arceuthobium). Washington D. C: Forest Service. 1972.