(1981). Guide to R2D2-Rapid Retrieval Data Display C.A. Pearson. [microform].
Cita Chicago (17th ed.)Guide to R2D2-Rapid Retrieval Data Display C.A. Pearson. [microform]. 1981.
Cita MLA (9th ed.)Guide to R2D2-Rapid Retrieval Data Display C.A. Pearson. [microform]. 1981.
Atenció: Aquestes cites poden no estar 100% correctes.