Have the option to input n.d. for an undated article
When trying to put n.d. into the "date" section of a reference, it just seems to think it is an incorrect input/date and will not allow for this. However, in the real world, quite a few sources from time to time are undated, and this puts a crimp in everything when you cannot put n.d. per APA format. Please add this functionality to either input our own term of n.d. or to select that the source is undated so it can be automatically entered into the reference. Thank you.

I’m happy to update that this is now supported.
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Katharine Thompson commented
Yes! I've been asking for this for over a year. and it's not an enhancement - both Harvard and APA use n.d. so RefWorks should have coded the option to use text in the publication field - its a error that needs fixing.