Cita APA (7a ed.)

(1979). Publishers' International Directory with ISBN Index. K.G.Saur.

Cita Chicago Style (17a ed.)

Publishers' International Directory with ISBN Index. München ; New York: K.G.Saur, 1979.

Cita MLA (9a ed.)

Publishers' International Directory with ISBN Index. K.G.Saur, 1979.