21 days of drawing : International summer seminar for advanced studies.

MLA

21 Days of Drawing : International Summer Seminar for Advanced Studies. Como: Fondazione Antonio Ratti, 1988.

APA

(1988). 21 days of drawing : International summer seminar for advanced studies. Como: Fondazione Antonio Ratti.

Chicago

21 Days of Drawing: International Summer Seminar for Advanced Studies. Como: Fondazione Antonio Ratti, 1988.