APA (7th ed.) Citation

Muir, D. N. (1990). Postal reform and the penny black: A new appreciation.

Chicago Style (17th ed.) Citation

Muir, Douglas N. Postal Reform and the Penny Black: A New Appreciation. 1990.

MLA (9th ed.) Citation

Muir, Douglas N. Postal Reform and the Penny Black: A New Appreciation. 1990.

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