"Contractes." . . "Overeenkomstenrecht." . . . . . . "Lehrbuch" . . . . . . . . . . "Perspectives on contract law"@en . . "Perspectives on contract law" . . . . . . . . "Supplemental \"classic\" as well as recent readings on contract law organized under the following headings: Enforcing private agreements -- Mutual assent --Enforceability -- Performance and breach -- Defenses to contractual obligation."@en . . . . . . . . . . . . "Contratti - Stati Uniti d'America." . . "Contractes Estats Units d'Amèrica." . . "USA." . . "Vertragsrecht." . . "Estats Units d'Amèrica." . . "Contratos Legislación Estados Unidos." . .