Here are the references I used last week in my dharma talk:
Bhikkhu Bodhi's comentary on the Upanisa Sutta on Access to Insight:
Christina Feldman's commentary on Dependent Origination:
I recommend both of these articles very highly. They really explain karma, interconnectedness, and the way positive mind states interweave to bring about liberation.
Here is the reference for the poems I read: "Still Point" and "Awakening Now" by Danna Faulds in her book Go In and In.