As an introduction to several bellow-posted books written by Валерий Высоцкий, I have to say that after I have read them, I ceased to buy all the bullshits from the Western World and European Union, and began to use them only to make a fire in the oven. As a rule, these books are missing several most important things, which are how to train and test your Wolfhound in the proper way, how to understand him and by which attitude approach him, his psychology and other things. However, the information posted in the following books is much more valuable (although it still is not everything), especially for the people who wish to educate their Caucasian Ovcharkas properly.
Кавказская Овчарка (Caucasian Ovcharka)
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Дрессировка отечественных волкодавов (Training of Native Wolfhounds)
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Собака сопровождения (The Dog of Escort)
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Here is one more book, from a different author, which describes the history and standard of the CO very well.
Кавказская Овчарка (Caucasian Ovcharka)