Northrup, H. R., Storholm, G. R., & paul, A. A. (1967). Restrictive labor practices in the supermarket industry. University of Pennsylvania Press.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Northrup, Herbert Roof, Gordon R. Storholm, ба A. Abodeely paul. Restrictive Labor Practices in the Supermarket Industry. Philadelphia: University of Pennsylvania Press, 1967.
MLA -ийн эшлэл (9 дэх хэвлэлт)Northrup, Herbert Roof, et al. Restrictive Labor Practices in the Supermarket Industry. University of Pennsylvania Press, 1967.