MLA

Marinetti, F. T., 1876-1944. No year "Sabato" Son felice di vedere... 4 p.; 1910 Jun 9 2 p.; 1912 Aug 3 3 p.; 1913 Mar 14 4 p. Note on page 4 by Papini; 1913 Apr 6 4 p.. Box 16, folder 1014. 1898-1970. https://collections.library.yale.edu/catalog/2055263.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 16, folder 1014"])(1898-1970)[No year "Sabato" Son felice di vedere... 4 p.; 1910 Jun 9 2 p.; 1912 Aug 3 3 p.; 1913 Mar 14 4 p. Note on page 4 by Papini; 1913 Apr 6 4 p.]. https://collections.library.yale.edu/catalog/2055263.