Graphis posters 81; the international annual of poster art.

MLA

Herdeg, W. Graphis Posters 81; the International Annual of Poster Art. Zürich: Graphis press corp., 1981.

APA

Herdeg, W. (1981). Graphis posters 81; the international annual of poster art. Zürich: Graphis press corp.

Chicago

Herdeg, W. Graphis Posters 81; the International Annual of Poster Art. Zürich: Graphis press corp., 1981.