Gb7714-87 Endnote Guide
In EndNote, for items with no publication year, type n.d. (no date) in the Year field. Then in the style editor, under Bibliography > Sorting , set the rule for missing years to "Place at end."
: Automatically applies "等" (děng) for Chinese sources or "et al." for English sources when there are more than three authors. 📥 How to Install the Style gb7714-87 endnote
Assuming you choose Method 1 (cloning and editing), here is the exact walkthrough for EndNote 20/21/X9. In EndNote, for items with no publication year, type n