Emma - the marathon schedules are in the book "Advanced Marathoning" by Pfitzinger and Douglas (hence, P&D). there are some copies of the plans floating around the internet, but I recommend getting the book to fully understand the schedules. Other distances are covered in "Road Racing for Serious Runners". The marathon book is easier to follow, because it lays out solid plans, while the road racing book leaves you to fill in the gaps in the plans.
Edited: 21/05/2013 at 14:58