Cita APA (7a ed.)
Polanka, S. No Shelf Required: E-Books in Libraries. American Library Association.
Cita estilo Chicago (17a ed.)
Polanka, Sue. No Shelf Required: E-Books in Libraries. Chicago, EUA: American Library Association.
Cita MLA (9a ed.)
Polanka, Sue. No Shelf Required: E-Books in Libraries. American Library Association.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.