This small and inexpensive book uses lists to present a rather complete Bible study on prayer. Each list is short and can be done one per day as part of a regular devotional study. The second half has many famous examples of prayer written out and also a section of prayers listed by event; therefore, this book can also be used as a prayer book as well as a Bible study.
The lists at the beginning of the book include Bible verses on such topics as: why pray, postures for prayer, Biblical terms for prayer, how we should come before God, conditions for answered prayer, Bible promises about prayer, and several categories of Biblical prayers. There is a chapter going into more depth about how to pray. Then a chapter with mostly Old Testament prayers written out; a chapter on Jesus' teaching regarding prayer; a chapter of quotations from famous people concerning prayer; a chapter of famous prayers collected in one place (such as the Serenity Prayer, St. Patrick's Breastplate, Prayer of St. Francis, and others); and closing with a chapter of prayers for special occasions (weddings, birthdays, holidays, etc.).
I found Prayer Vitals by Tracy M. Sumner to be a very practical guide and will probably continue to use it as a devotional for many years to come, even after I finish going through the study part. I have been looking for a good reference book on prayer like this for a long time. Prayer Vitals is more useful than All the Prayers of the Bible by Herbert Lockyer, because it is shorter and more to the point; not filled with the excess verbiage of Lockyer's older style of writing.