Não informado. (2020). Report on the Progress and Condition of the Royal Botanic Gardens at Kew. Her Majesty's Stationery Office.
Chicago-referens (17:e uppl.)Não informado. Report on the Progress and Condition of the Royal Botanic Gardens at Kew. London: Her Majesty's Stationery Office, 2020.
MLA-referens (8:e uppl.)Não informado. Report on the Progress and Condition of the Royal Botanic Gardens at Kew. Her Majesty's Stationery Office, 2020.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.