APA

Arnold Arboretum, . (19911991). Journal of the Arnold Arboretum. [Cambridge, Mass.]: [Harvard University, Arnold Arboretum].

Chicago

Arnold Arboretum, . 19911991. Journal of the Arnold Arboretum. [Cambridge, Mass.]: [Harvard University, Arnold Arboretum].

Harvard

Arnold Arboretum, . (19911991). Journal of the Arnold Arboretum. [Cambridge, Mass.]: [Harvard University, Arnold Arboretum].

MLA

Arnold Arboretum, . Journal of the Arnold Arboretum. [Cambridge, Mass.]: [Harvard University, Arnold Arboretum]. 19911991.