APA (7th ed.) Citation

Piper, D. (1954). The National Portrait Gallery: Some recent acquisitions.

Chicago Style (17th ed.) Citation

Piper, David. The National Portrait Gallery: Some Recent Acquisitions. 1954.

MLA (9th ed.) Citation

Piper, David. The National Portrait Gallery: Some Recent Acquisitions. 1954.

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