APA (7th ed.) Citation

Bibesco, M. P. (1928). Royal Portraits. Appleton.

Chicago Style (17th ed.) Citation

Bibesco, Marthe Prinzessin. Royal Portraits. New York, London: Appleton, 1928.

MLA (9th ed.) Citation

Bibesco, Marthe Prinzessin. Royal Portraits. Appleton, 1928.

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