The Instrument Rating Workbook is a ring-bound, letter-size workbook as shewn in the picture below. This format allows the book to be opened flat on a table for making notes.

The workbook is available in a student edition without hints and answers and also in an instructor edition with teaching hints and answers for the more complex questions. The workbook is in two parts:
The cost of the workbook and sample pages can be found here.
The IFR workbook is largely self-contained but, in order to use it, you will need access to a recent Canada Flight Supplement (CFS), a Toronto VNC chart, a LO5/6 LO-altitude en route chart, the Ontario section of the Canada Air Pilot, the Canada Air Pilot general pages and some form of aviation calculator such as an ASA CX-2. These materials can be obtained from any pilot shop.
An analogue E6B sliderule, while of some historical interest, is strongly not recommended, either for completing the groundschool portion of the course or for use in an examination.