I haven't found any specific books as a go to book for inpatient psych.
My recommendations are go up quick on meds so long as it's within the guidelines, have PRNs ready, be savvy in identifying malingering, don't hospitalize borderline PD unless it's severe (even then hospitalization is questionable at best) unless there's comorbid problems that also need treating, work with a great psychologist as a partner, also a great social worker, listen to good staff members, and foster leadership and teamwork cause whether you like it or not a doctor on an inpatient unit is a leader and not simply a member of the team.