APA (7th ed.) Citation

Haab, A., & Haettenschweiler, W. (1972). Lettera 4 : a standard book of fine lettering: A standard book of fine lettering. Academy Editions.

Chicago Style (17th ed.) Citation

Haab, Armin, and Walter Haettenschweiler. Lettera 4 : A Standard Book of Fine Lettering: A Standard Book of Fine Lettering. London: Academy Editions, 1972.

MLA (9th ed.) Citation

Haab, Armin, and Walter Haettenschweiler. Lettera 4 : A Standard Book of Fine Lettering: A Standard Book of Fine Lettering. Academy Editions, 1972.

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