The following are various resources (online and in print) that are useful tools for learning more about prayer.
Prayers That Avail Much for Business, by Germaine Copeland
Prayer That Avail Much for Daily Living, by Germaine Copeland
Prayers That Avail Much for Mothers, by Germaine Copeland
NEW Oraciones con Poder / Prayers That Avail Much, by Germaine Copeland
A Prayer for Every Need, by Norman Vincent Peale
The Right Prayers for Every Need, by Christine Dallman, Randy Peterson & Editors of Publications International Ltd.
Prayers for Every Day, by Editors of Publications International Ltd.
(Prayer) Finding the Hearts True Home, by Richard J. Foster
Harper Collins 1992
(Prayer), by Andrew Murry
Whitaker House 1998
Prayers That Avail Much Vol I, II, III
Harrison House 1989
God’s Promises for Your Every Need
Word Publishing 1995