Blunch N. Paul E. Green and Donald S. Tull: Research for Marketing Decisions . Prentice-Hall, Inc., Englewood Cliffs, N. ,J. 1966. le [Internet]. 1967 Jan. 1 [cited 2025 Dec. 6];31. Available from: https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/34367