APA (7th ed.) Citation

(1986). The Encyclopedia Americana Volume 21 Oporto to Photoengrafing. Palgrave Macmillan.

Chicago Style (17th ed.) Citation

The Encyclopedia Americana Volume 21 Oporto to Photoengrafing. Palgrave Macmillan, 1986.

MLA (8th ed.) Citation

The Encyclopedia Americana Volume 21 Oporto to Photoengrafing. Palgrave Macmillan, 1986.

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