APA (7th ed.) Citation

Haab, A., & Haettenschweiler, W. (1971). Lettera 2 : a standard book of fine lettering: A standard book of fine lettering (4th edition.). A. Niggli.

Chicago Style (17th ed.) Citation

Haab, Armin, and Walter Haettenschweiler. Lettera 2 : A Standard Book of Fine Lettering: A Standard Book of Fine Lettering. 4th edition. Teufen AR, Switzerland: A. Niggli, 1971.

MLA (9th ed.) Citation

Haab, Armin, and Walter Haettenschweiler. Lettera 2 : A Standard Book of Fine Lettering: A Standard Book of Fine Lettering. 4th edition. A. Niggli, 1971.

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