Não informado. (2021). Annual Report of the Canal Zone Plant Introduction Gardens. Panama Canal Press.
Chicago-referens (17:e uppl.)Não informado. Annual Report of the Canal Zone Plant Introduction Gardens. Panamá: Panama Canal Press, 2021.
MLA-referens (8:e uppl.)Não informado. Annual Report of the Canal Zone Plant Introduction Gardens. Panama Canal Press, 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.