MLA

Natalini, Adolfo, 1941-. Caro studente o cultore dell'ambiente = Dear student or environment cultivator ... [Italy : s.n., 1971]. Box 1a, folder 33. 1971. https://collections.library.yale.edu/catalog/16169162.

APA, 6th edition

Natalini, Adolfo, 1941-. (["Box 1a, folder 33"])(1971)[Caro studente o cultore dell'ambiente = Dear student or environment cultivator ... [Italy : s.n., 1971]]. https://collections.library.yale.edu/catalog/16169162.