Please take a look at some excellent judo reading

The History of Kodokan Judo	Judo Etiquette	Black Belt
Rules of Randori By Neil Ohlenkamp	Principles of Balance	Junior Promotional Requirements
Senior Promotional Requirements	Do's and Don'ts in Learning Judo	Go Kyo No Waza
Additional Techniques	Counters(Kaeshi)	NAGE NO KATA
KATAME NO KATA	Vocabulary