Cita APA (7a ed.)

Sirilli, G. (1987). Patents and inventors: An empirical study. [s.n.].

Cita Chicago Style (17a ed.)

Sirilli, Giorgio. Patents and Inventors: An Empirical Study. [S.l.]: [s.n.], 1987.

Cita MLA (9a ed.)

Sirilli, Giorgio. Patents and Inventors: An Empirical Study. [s.n.], 1987.