Viewing science as a human practice, partly dependent on the developments in scholarly publishing, what is considered scientific may depend on a plethora of factors besides the implementation of scientific methods – that is; historical, cultural, social, and economic realities. The present study investigates how the distinction between science and pseudoscience is mediated on Wikipedia through the sources used to substantiate this distinction. One of the most visited places on the web, Wikipedia is increasingly considered trustworthy, although relatively little is known about its sources. 469 references tied to 114 Wikipedia articles were investigated bibliometrically. Publication types, disciplines, science branches, primary publishers, owning institutions and institution types were identified, and the interconnections between these studied. Two word frequency analyses were conducted; one on the key sentences tied to the demarcation of science from pseudoscience in the Wikipedia articles, and one on the abstracts of the scholarly articles referred to there.