A Guide to Yarn Substitution - Skein
How to Substitute Yarn for Patterns
Using Ravelry to Find a Yarn Substitution — Ms. Cleaver - Creations for a Handmade Life
Double the Fun: A Guide to Holding Two Yarn Skeins Together - Easy Crochet Patterns
Color Curiosity: What Is Going on with those Skeins? – Modern Daily Knitting
3 Tips for Yarn Substitutions – Olive Knits
Yarn Weight Guide (+ Yarn Conversion Chart) - Handy Little Me
How to wind a skein of yarn by hand - without getting it tangled - YAK
A Beginner's Guide to Yarn Substitution – TONIA KNITS
Yarn Substitutions Made Easy - TL Yarn Crafts