My copy of "Parrakeets of The World" was published in 1979. However, Amazon.com appears to have more recent, inexpensive copies. Here are scans of the front and back cover of my hard copy book.
I glean valuable bits of information from many bird books, but ignore any material that I disagree with. "Take what you like and leave the rest."
Click to Link to Amazon for this book: Parrakeets of the World