Hello I am writing a book about a certain group of products. It is by no means a scientific book, although has technical info at the basic level in some places, describing categories of products, terms and concepts related to that product group, various information sources, companies list, has pictures or graphs as necessary to describe things better as applicable. Although I know English well, it is not my native language so I want to get opinions. I am thinking about naming my book as one of the following: (that product name) reference guide reference to (that product name (in plural)) (that product name) guide guide for (that product name (in plural)) which do you think is best? or any other suggestions? I am sorry if this is not the right place to post this... Thanks in advance... !