Art. 14 CISG
(1) A proposal for concluding a contract addressed to one or more specific persons constitutes an offer if it is sufficiently definite and indicates the intention of the offeror to be bound in case of acceptance. A proposal is sufficiently definite if it indicates the goods and expressly or implicitly fixes or makes provision for determining the quantity and the price.
(2) A proposal other than one addressed to one or more specific persons is to be considered merely as an invitation to make offers, unless the contrary is clearly indicated by the person making the proposal.
The Secretariat Commentary on Art. 12 of the 1978 New York Draft, predecessor to Art. 14 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
CISG-AC Opinion regarding Art. 14 CISG
CISG-AC Opinion No. 13 ‘Inclusion of Standard Terms under the CISG’ (Rapporteur: Sieg Eiselen), adopted by the CISG Advisory Council following its 17th meeting in Philadelphia (USA) on 20 January 2013
Overview of case law on Art. 14 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.