diff --git a/book/basics/wood/information.ipynb b/book/basics/wood/information.ipynb
index 27179a4..f53fc22 100644
--- a/book/basics/wood/information.ipynb
+++ b/book/basics/wood/information.ipynb
@@ -4,7 +4,25 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Information"
+    "# Information\n",
+    "\n",
+    "## Different sources\n",
+    "\n",
+    "  - **Internet**\n",
+    "    - [Centrum Hout](https://www.centrumhout.nl/) buildings, bridges, other structures, photos, ideas\n",
+    "    - [houtdatabase.nl](https://www.houtdatabase.nl/) durability properties of timber species\n",
+    "\n",
+    "  - **Books**: \n",
+    "    - Holzbau Atlas, J. Natterer, T. Herzog, M. Volz: buildings, photos, drawings, connections.\n",
+    "    - STEP 1, 2 Timber Engineering, Centrum Hout: calculation methods for timber structures\n",
+    "    - Timber Construction Manual, Brikhäuser: examples of timber structres and connections\n",
+    "\n",
+    "  - **Magazines**:\n",
+    "    - Het Houtblad (ductch), Centrum Hout\n",
+    "    - Hout in de bouw (dutch), Schiedam Nijgh Periodieken\n",
+    "\n",
+    "  - **Search terms**:\n",
+    "    - Glulam, cross laminated timer"
    ]
   },
   {