<human>:  Can you recommend some popular books about long distance relationships?
<bot>: 
1. Long Distance Love: The Complete Guide to Loving from Afar by Tammy L. Fontaine
2. The Long Distance Relationship Survival Guide: Secrets and Strategies from Successful Couples Who Have Gone the Distance by Chris Bell
3. Long Distance Relationships: The Complete Guide by Tom Keith
4. Long-Distance Love: A Survival Guide for Loving from a Distance by Julia Clay
5. Long-Distance Relationships: The Complete Guide to Making Them Work by Steve Marsh and Kara Oh
6. Long Distance Love: The Complete Guide to Loving Across Distance by Nicholas A. Braun