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hdbg5,
if you are preparing a paper for an assignment, then your school (college, university, whatever) will have its own guidelines to follow, and these will be more or less based on one of the standard forms of referencing.
Other than that, a Google search of referencing styles and guides will give you the information you seek for the particular referencing style you are expected to use.
In general terms, where referencing or citing a source which does not have a publishing date, then [author] undated is a common substitute.
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"I don't know ... I'm making it up as I go ..." - Dr I Jones
Nature abhors perfection - cats abhor a vacuum!
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