Citazione Stile APA (7a Edizione)

Lockley, L. C. (1952). Making letters build business. s.n.

Citazione stile Chigago Style (17a edizione)

Lockley, Lawrence Campbell. Making Letters Build Business. Los Angeles: s.n, 1952.

Citatione MLA (9a ed.)

Lockley, Lawrence Campbell. Making Letters Build Business. s.n, 1952.