"Verenigde Staten." . . "USA." . . "Urheberrecht." . . . . . "Principles of copyright law" . "Principles of copyright law"@en . . . "Electronic books"@en . . "Study aids"@en . . . . . "Lehrbuch" . . . . . . "Schechter and Thomas' principles of copyright law"@en . . . "Auteursrecht." . .