diff --git a/_includes/guide_contracts.md b/_includes/guide_contracts.md
index dd7a5abf..490f82d5 100644
--- a/_includes/guide_contracts.md
+++ b/_includes/guide_contracts.md
@@ -188,10 +188,10 @@ For larger payments, Bitcoin transaction fees are very low as a
 percentage of the total transaction value, so it makes more sense to
 protect payments with immediately-broadcast separate transactions.
 
-**Resource:** The [bitcoinj](http://bitcoinj.org) Java library
+**Resource:** The [bitcoinj][] Java library
 provides a complete set of micropayment functions, an example
 implementation, and [a
-tutorial](https://bitcoinj.github.io/working-with-micropayments)
+tutorial][bitcoinj micropayment tutorial]
 all under an Apache license.
 
 {% endautocrossref %}
diff --git a/_includes/guide_operating_modes.md b/_includes/guide_operating_modes.md
index bedd7bab..42fb6ac7 100644
--- a/_includes/guide_operating_modes.md
+++ b/_includes/guide_operating_modes.md
@@ -73,7 +73,7 @@ scripts and pubkey scripts, and more. This enables P2SH transaction finding.
 
 If a user is more privacy-conscious, he can set the Bloom filter to include more false positives, at the expense of extra bandwidth used for transaction discovery. If a user is on a tight bandwidth budget, he can set the false-positive rate to low, knowing that this will allow full nodes a clear view of what transactions are associated with his client. 
 
-**Resources:** [BitcoinJ](http://bitcoinj.org), a Java implementation of Bitcoin that is based on the SPV security model and Bloom filters. Used in most Android wallets.
+**Resources:** [BitcoinJ][], a Java implementation of Bitcoin that is based on the SPV security model and Bloom filters. Used in most Android wallets.
 
 Bloom filters were standardized for use via [BIP37](https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki). Review the BIP for implementation details.
 
diff --git a/_includes/references.md b/_includes/references.md
index 53343afe..fa4ff871 100644
--- a/_includes/references.md
+++ b/_includes/references.md
@@ -330,6 +330,7 @@
 [Bitcoin Seeder]: https://github.com/sipa/bitcoin-seeder
 [bitcoin-documentation mailing list]: https://groups.google.com/forum/#!forum/bitcoin-documentation
 [BitcoinJ]: http://bitcoinj.github.io
+[bitcoinj micropayment tutorial]: https://bitcoinj.github.io/working-with-micropayments
 [block170]: https://www.biteasy.com/block/00000000d1145790a8694403d4063f323d499e655c83426834d4ce2f8dd4a2ee
 [casascius address utility]: https://github.com/casascius/Bitcoin-Address-Utility
 [core base58.h]: https://github.com/bitcoin/bitcoin/blob/master/src/base58.h