The 25-year-old shared a shot of Willard Hartley's "His Needs, Her Needs: Building an Affair-Proof Marriage" on Instagram on Thursday, January 23, and noted it has become one of his "essential" reads.
Before the pair wed in September, 2018, the "Baby" hitmaker confessed to bad behaviour that was harmful to his past relationships.
"I started doing pretty heavy drugs at 19 and abused all of my relationships," he wrote on the photo sharing site at the time. "I became resentful, disrespectful to women, and angry."
"It took years to bounce back from all these terrible decisions, fix broken relationships, and change relationship habits."
Bieber's new-found research comes just days after he declared his love for Hailey on social media.
"I like to make my wife feel special and valued," he gushed. "I've done a lot of cool things, but I don't think anything comes close to as cool as that."
He also explained her has focused on maintaining "patience, commitment, kindness, humility" after becoming a husband.