K-ON! – Volume 03

Dynasty Reader » K-ON! Story Anthology Comic ch03

KEION!GEEK - a K-On! fan blog: K-On! Blu-Ray US vs. JP review and comparison (vol 3)

K-ON! Vol. 3 eBook : Kakifly, kakifly, Jack Wiedrick, Kakifly: Kindle Store

K-On! / Keion vol.1-4 Complete Set - Manga by Kakifly JAPAN

K-ON! Volume 3 - Review

K-ON! Volume 3, K-ON! Wiki

Now, I could be wrong about this, but I'm like 95% sure that this one shot of Ritsu from the second OP is supposed to be a reference to her manga cover.

Fairy Idol Kanon Volume 3 (Fairy Idol Kanon, 3) - Hakamada, Mera: 9781897376911 - AbeBooks

About the Blu-ray - K-On! - Volume 3

K-ON!, Vol. 3 (K-ON!, 3) by kakifly

K-on! Ultimatemegax's blog

K-ON! -3- Volume 3

Prepare For More Schoolgirl Anime in Ruri Miyahara's Love Lab - Crunchyroll News

Review for K-On! - Volume 3

Blu-Ray Disc in Beautiful Mint Condition . Authentic U.S. Release. Region A/1 (UNLESS OTHERWISE NOTED).

K-On! Volume 3 (Blu-ray, 2011, Disc in MINT Condition)