I have no clue how much a cup is. We don't measure things in cups here. Maybe two cups are the equivalent of two cups of tea, or two glasses of water? I'd say 400ml but I don't know. Experiment.
The book is
Green for Life by Victoria Boutenko. It's not a recipe book. In most of the book, she explains
why green smoothies are so great for health. At the end of the book there's a small section with green smoothie recipes.
If you want some of them, PM me.