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The number of references per paper, perhaps the best single index of ajournal's scholarliness, has been studied in different disciplines and periods.In this paper we present a four decade study of eight engineering journals. Adata set of over 70000 references was generated after automatic data gatheringand manual inspection for errors. Results show a significant increase in thenumber of references per paper, the average rises from 8 in 1972 to 25 in 2013.This growth presents an acceleration around the year 2000, consistent with amuch easier access to search engines and documents produced by thegeneralization of the Internet.

Growth in the number of references in engineering journal papers during the 1972-2013 period