Cita APA (7th ed.)

o.V & Willam of Amsterdam. (1969). Art 69. o.V..

Cita Chicago (17th ed.)

o.V i Willam of Amsterdam. Art 69. o.O.: o.V., 1969.

Cita MLA (8th ed.)

o.V i Willam of Amsterdam. Art 69. o.V., 1969.