APA (7th ed.) Citation

Text on back: 'G.B.S. celebrates 90th birthday'.

Chicago Style (17th ed.) Citation

Text on Back: 'G.B.S. Celebrates 90th Birthday'.

MLA (8th ed.) Citation

Text on Back: 'G.B.S. Celebrates 90th Birthday'.

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