1993 Circuit Training for Tennis by Dave Reddin and Paul Dent

https://docs.google.com/file/d/0B6AwqUz43jJ5ODY0YmxmNlZpN3M/edit?usp=sharing

1992 Speed training related to co-ordination, anticipation, reaction, footwork and concentration by Leonardo Snelleman

https://docs.google.com/file/d/0B6AwqUz43jJ5UW9fak1XNUswQW8/edit?usp=sharing

1993 Tactics by Richard Shoenborn

Here's a great article on specific drills to enhance playing performance.

https://docs.google.com/file/d/0B6AwqUz43jJ5N0pyV2RxQkhsams/edit?usp=sharing