APA (7th ed.) Citation

National Trust (Great Britain). (1975). Wallington Gardens, Northumberland. The National Trust.

Chicago Style (17th ed.) Citation

National Trust (Great Britain). Wallington Gardens, Northumberland. [London?]: The National Trust, 1975.

MLA (9th ed.) Citation

National Trust (Great Britain). Wallington Gardens, Northumberland. The National Trust, 1975.

Warning: These citations may not always be 100% accurate.