Não informado. (2020). Research Reports. Smithsonian Institution, Office of Public Affairs.
Chicago-viite (17. p.)Não informado. Research Reports. Washington: Smithsonian Institution, Office of Public Affairs, 2020.
MLA-viite (8. p.)Não informado. Research Reports. Smithsonian Institution, Office of Public Affairs, 2020.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.