All books are entirely in English unless noted otherwise. International orders billed at cost. Hand me a book and I'll tell you straight off if it's a bookclub edition. Sometimes it can be hard for most booksellers to know if it's a bookclub, like university press books.
They don't normally put the price on the jacket for the publisher's edition, but most of them do use full or partial cloth binding, whereas the bookclub edition will be simply cheap board covers. Though let's face it, most of the publisher's editions these days aren't all that great in quality either, the bookclubs are even worse!