"launch a book" is a perfectly correct and usable phrase in written English.
You can use it to refer to the act of releasing a book or a book's publication. For example: "The author is planning to launch her book in June."
Years ago I was at a lunch to launch a book that Ashmead was publishing; I think it was "Pilgrim" by the late Timothy Findley.
Ronald and Bryan Williams, the founders of the rap music label Cash Money Records, plan to launch a book imprint called Cash Money Content.
Larkin is talking about the Oxford party, but the literary party proper is (I think) on the decline – especially the one to launch a book.
If there is "one form of advertisement" that he loathes, it is, he says, "the cocktail party that is given to launch a book.
In the 1930s Foyles began a series of literary lunches at the Dorchester, and more recently the Radisson Blu Edwardian became the first UK hotel to launch a book club.
On Twitter, where he has almost 225,000 followers, he told fans he was also about to launch a book, giving an early indication of the buzz his management is expecting.
Last June, she launched a book.
Mark Zuckerberg has discovered "the book" – he finds them "intellectually stimulating" and has just launched a book club.
The Playhouse is also launching a book to commemorate the anniversary - Liverpool Playhouse: A Theatre and Its City.
We are doing standup comedy awards on Steve Wright's show, Simon Mayo's launched a book club in drivetime.
"I was shocked and depressed," said Fatos Lubonja, a famous Albanian writer who was launching a book in London the following day.
