Six Literal Days or Six Long Time Periods:  
What Do the Scriptures Teach

Genesis 2:7, 9, 19 tells us that God made the plants, trees, animals, birds, and man, not from one another, but from the something else entirely.  Exodus 20:11 compares a literal week to a literal creation (week).  Psalm 33:6-9 and Heb. 11:3 tell us that God is a LOT more powerful than us, and can Create merely by speaking.  Mark 10:6 also says that God made man and woman at the "beginning of Creation" as opposed to -- millions or billions of years later -- near the end.

See the following links for more details

The Big Picture, by Ken Ham

Reformed Theology and Six Day Creation, by Dr. Kenneth L. Gentry

Six Literal Days of Creation, by Gary Nystrom

The "Days" of Creation in Genesis 1: ..., by Gerhard F. Hasel

The Six Days of Creation,  by Jimmy Akin

How Long Were the Days of Genesis, by Thomas Key

Can You Be an Old Earth Believer? by (?????) Answers in Creation

Six Day Creation, by Grover Gunn

Six Days?  Honestly!  Christian Answers.Net

Is the Bible clear about the age of the Earth and Universe?  Christian Answers.Net

Six Days of Creation, by (?????)

Old Testament References to Creation after the Book of Genesis, by Lambert Dolphin

Augustine and Orthodoxy in the Creation Day Debate, by Louis Lavallee

Creation Passages: "In Six Days" and "Evening and Morning", by David E. Pratte