Establishing and maintaining milk supply
when baby is not nursing @ 
Long-Term Pumping When Direct Breastfeeding Doesn’t Work Out by Linda J. Smith, BSE, FACCE, IBCLC
Pumping for the High-Risk Newborn from Lucile Packard Children’s Hospital
Exclusive Pumping – The Best… Expressed! by Paula Yount
Mothers Who Forgo Breastfeeding for Pumping by Nancy Mohrbacher, IBCLC
Expression of Love: Breastmilk Pumping for Your Baby, from Ayla Birth, Inc. Breastmilk pumping when mom has lost custody or is incarcerated – this a great way to provide for baby and to maintain connection when mom and baby are separated.
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Supporting the Human-Milk-Feeding Mother by Jill Landis, from LEAVEN, Vol. 37 No. 1, February-March 2001, p. 3-6.