- https://www.producthunt.com/discussions/asks-for-feedback-ph-i-am-building-an-app-to-rule-all-web-based-saas?comment=3466657
- https://acrobat.uservoice.com/forums/595576-acrobat-reader-for-android/suggestions/45504544-i-want-to-refer-multiple-pdfs-while-reading-and
- https://support.discord.com/hc/en-us/community/posts/4406526925207-i-can-t-open-the-app-on-mobile?page=1#community_comment_23277671737367
- https://getrevising.co.uk/resources/ocr-a2-rs-ethics-notes
- https://my.cbn.com/pg/file/dabce691-46e0-4089-bc8e-8717ebec8e76/read/146473/money-savvy-kids/