APA (7th ed.) Citation

Mary, P. R. (1914). Princess Mary's gift book .. Hodder & Stoughton.

Chicago Style (17th ed.) Citation

Mary, Princess Royal. Princess Mary's Gift Book .. London, New York [etc.]: Hodder & Stoughton, 1914.

MLA (9th ed.) Citation

Mary, Princess Royal. Princess Mary's Gift Book .. Hodder & Stoughton, 1914.

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