How much do academics cite work in another discipline?

Sociologist Jerry Jacobs has a new book about the value of specific academic disciplines and presents this data regarding how much academics cite work outside their field:

“Interdisciplinarity depends on strong disciplines,” he said.

He said he became interested in the topic while serving as editor of American Sociological Review. He wanted to see if the articles in that journal were showing up as citations in the work of non-sociologists, and found that they were, leading him to question the idea that disciplines don’t communicate with one another. Using National Science Foundation data, he looked at where science journals are cited, and found that a “substantial minority” of citations come in other fields.

Citation Outside of Disciplines

Discipline % of Citations From Outside Field
Physics 18.3%
Chemistry 31.0%
Earth and space sciences 16.8%
Mathematics 22.6%
Biology 38.3%
Biomedical research 24.6%
Clinical medicine 28.6%
Engineering and technology 38.1%
Psychology 34.5%
Social sciences 22.7%

Jacobs then analyzes the various social sciences, and finds that scholars in the interdisciplinary field of area studies are more likely to cite non-area studies work than their own fields, while economics scholars are mostly likely to cite their own field. “These data on cross-field citations raise an important question for advocates of interdisciplinarity, namely whether the fields that are most open to external ideas are also the most intellectually dynamic,” Jacobs writes. “If this were true, area studies would be the envy of the social sciences, and economists would be busy trying to figure out how best to emulate the success of areas studies scholars. In fact, the reverse is true: economics is the most influential field in the social sciences, and it is also the most inwardly focused.”

While interdisciplinary is a hot topic, it is nice to see some data on the topic. How much should scholars cite those outside their disciplines? Jacobs suggests here that he thinks 20-30% of citations outside of one’s field is a good total – roughly one-fifth to one-third of citations. Should this be higher? Who gets to set these guidelines? The table also suggests this can vary quite a bit across disciplines.

I’ve noticed in my own research that certain topics in sociology lend themselves to more interdisciplinary citations, particularly for certain subject matter and new areas of study. I study within the subfields of urban sociology and the sociology of culture, subjects with plenty of sociologists but also plenty of interest in other disciplines. Some of my recent projects have been more historical, meaning I’m interacting more with historians, and about the media, meaning I’m interacting with work in media studies, communication, English, and elsewhere. Also, studying less-studied topics means one has to go further afield to understand what all of academia has said. In my work with McMansions, I’ve found that sociologists haven’t said much so I’ve worked with sources in history, planning, law, and housing (a rather interdisciplinary field).

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