Our favorite sites for care and feeding are:

https://petgerbils.org/health-illness/

Gerbils on the Quay - Care and Feeding

Gerbils on the Quay - Equipment and Supplies

American Gerbil Society

The Gerbils dot com

The best information we have found on gerbil colors and genetics:

Shooting Star Gerbils - Colors

Simplified locus-by-locus Genetics Guide

The Gerbils - Colors

Introducing gerbils--split cage method:

Introducing Gerbils to Each Other

Split Cage / Split Tank

How to try to stop my gerbils from declanning:

How to try to stop my gerbils from declanning