Cita APA (7th ed.)

Oliver, T. L. (1993). D.D.R. collectors reference guides 1949-1990. T.L.O.-Publ..

Cita Chicago (17th ed.)

Oliver, Tony L. D.D.R. Collectors Reference Guides 1949-1990. Eton Wick, near Windsor: T.L.O.-Publ., 1993.

Cita MLA (8th ed.)

Oliver, Tony L. D.D.R. Collectors Reference Guides 1949-1990. T.L.O.-Publ., 1993.