Tony Blair's autobiography Journey is among the top titles borrowed by MPs - but the book most frequently lent by the Commons library is a guide to How Parliament Works.
MPs laughed loudly when the titles were revealed by John Thurso, representing the House of Commons Commission in the chamber.
He said MPs had borrowed How Parliament Works, by Robert Rogers and Rhodri Walters, 44 times during the current Parliament.
He added: "Erskine May's treatise on the law, privileges, proceedings and usage of Parliament, edited by the Clerk of the House, was borrowed 33 times.
"And in third place, Journey by Tony Blair, borrowed 31 times."
Labour MP Thomas Docherty, who asked the question, praised the guide as "informative and well-written".
How Parliament Works was first published in 2006 and is in its sixth edition.