Aha! Is the "Ning Yang Manual" the second volume of the "Nine Yin Manual"?
Edit: Ooor it's just a totally separate fictional manual in the same book series.
That's all the references, BTW. To put them all in one place:
The author of "Legends of This Strange & Beautiful World is, indeed, an amalgam of Xiong Yaohua and Chen Wengtong, two of the "greats" of classic wuxia.
The "Dragon's Nine Yang Manual" is a reference to the "Nine Yang Manual" that appears in the Condor Trilogy. There, the book was lost and the one man who mastered it recited parts of it to three different masters of the martial arts, who each interpreted what they heard differently based on their own understanding and took them back to their own martial societies, creating three lesser versions. The one you're being offered is another lesser version of the original.
"Five Rings, Nine Swords" is a reference to Miyamoto Musashi the "Sword Saint", author of "The Book of Five Rings" and Dugu Qiubai the "Sword Devil," who created a martial art called "The Nine Swords of Dugu." Supposedly, the author of the work witnessed a duel between the two and based his art around what he gleaned from the battle.
The "Eighteen Dragon-Subduing Palms" are one of the two secret martial arts unique to the Beggar Fraternity of Jin Yong's fictional universe.
And yes, the name of the author of "Learn By Doing? No, Learn By Teaching!" is in fact a reference to Bruce Lee.
@will408914, you get to choose your reward.
When someone realizes what the invisitext he discovered means and says it, they'll also get to pick one.