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

MLA

21 Days of Drawing : Summer Seminar for Advanced Studies In Drawing. Como: Fondazione Antonio Ratti, 1990.

APA

(1990). 21 days of drawing : summer seminar for advanced studies in drawing. Como: Fondazione Antonio Ratti.

Chicago

21 Days of Drawing: Summer Seminar for Advanced Studies In Drawing. Como: Fondazione Antonio Ratti, 1990.