Here are some books and websites that I have found to be helpful or informative:
Rethinking Suicide by Craig J. Bryan
Troubled Minds by Amy Simpson
When It Is Darkest: Why People Die by Suicide and What We Can Do to Prevent It by Rory O’Connor
Suicide Prevention: Stahl’s Handbooks
www.afsp.org
www.suicidepreventionlifeline.org
www.crisistextline.org
988 Suicide and Crisis Lifeline (in the United States of America), available 24 hours a day, 7 days a week: call or text 988 or chat at 988lifeline.org
Crisis Text Line – Text HOME to 741741