I'm writing a paper on a board game, Labyrinth, and I need to use some parts of the rule book. How should I reference this? I'm using Harvard reference style.
EDIT: I hadn't notice this earlier.
What can be found in the start of the rule book is this:
Author: Max J. Kobbert
And in the end, this:
© 2007 Ravensburger Spieleverlag
EDIT 2: I found a link to the rule book. The real one contains for several more languages but the content is the same.