In what book did the legend of Three Emperors and Five Emperors first appear?

Regarding the earliest source, Mr. Gu Jiegang's "Three Tests on Huang" has a detailed textual research (this little book is included in the Preface to Ancient History).

Regarding the textual research of the Five Emperors, we can refer to the article Talking with Mr. Qian about Ancient History and the short book Discrimination of the Warring States, Qin and Han Dynasties in the preface of Discrimination of Ancient History.

Well, well, in fact, the above content is the whole set of Introduction to Ancient History. ...