Cita APA (7a ed.)

E.W. Edwards & Son. Edwards vacuum components (1a ed.). [s.n.].

Cita Chicago Style (17a ed.)

E.W. Edwards & Son. Edwards Vacuum Components. 1a ed. Inglaterra: [s.n.].

Cita MLA (9a ed.)

E.W. Edwards & Son. Edwards Vacuum Components. 1a ed. [s.n.].