Stanford Encyclopedia of Philosophy: a citable reference
Most of what a search engine returns for a philosophical term is unusable in academic work. Encyclopaedias anyone can edit, course notes without an author, summaries of summaries. The information may even be right, but you cannot cite it, and you have no way of knowing when it was last correct.
The Stanford Encyclopedia of Philosophy solves exactly that problem, and it is free.
What it is
An encyclopaedia of philosophy maintained by Stanford University, with entries commissioned from specialists, signed, and editorially reviewed. Entries are revised as the literature moves, and, decisively, every earlier version is kept in a permanent archive with its own date.
That archive is what makes it citable. You cite the version you read, it stays retrievable, and your reader can check it. No collaborative encyclopaedia offers this.
Why it works as a source
Because an entry is written by someone who publishes on the topic, and it is read before publication by others who do. What you get is not a neutral summary but a map of the debate by a participant, with the disagreements marked as disagreements.
The bibliographies are the second reason. They are curated rather than exhaustive, which for a beginner is worth more: you learn what to read first instead of facing four hundred titles with no order.
How to use it
Read the bibliography before the entry. Three minutes there tells you who the main voices are and whether the question is settled or open.
Follow the related entries. The cross-references are deliberate; they trace the conceptual neighbourhood of a term, which is usually what you actually need.
Cite the dated version. Each entry carries a stable URL and a date. Use both, and your reference will still resolve in ten years.
For readers coming from theology
Much of the vocabulary of Christian doctrine — substance, person, will, necessity, eternity — is philosophical before it is theological. Reading the philosophical entry on a term before using it in a doctrinal argument is the cheapest correction available, and it prevents the most common error: taking a technical word to mean today what it meant when the creeds were written.
Open the Stanford Encyclopedia
Image: Saint Isidore of Seville, Bartolomé Esteban Murillo, 1655. Seville Cathedral, public domain. Isidore’s Etymologiae was the encyclopaedia of the Latin West for a thousand years.
