==Promotional references== 
 If the book was not used to source any of the information in the article (and you seem to have added the same reference to four other confectionery articles, without adding any new content to those articles), then it is misleading to cite it as a reference. By all means add useful new material sourced to the book, or challenge the incorrect "received wisdom" you've spotted, but simply adding the same book as further reading to multiple articles adds little to the encyclopaedia and could be regarded as inappropriately promotional.