← Search Journal of Political Economy Vol. 79 No. 4 1971 Joint Products and On-the-Job Training A. G. Holtmann DOI10.1086/259803 Volume79 Issue4 Pages929-931 Languageen Sources semanticscholar openalex crossref Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓