Flip the book open to the copyright page. This page is usually located after the title page and before any dedications or the table of contents and is filled with legal language.
Look at the bottom of the page for a descending series of numbers without any punctuation. It will appear as "10 9 8 7 6 5 4 3 2 1." If you have a first printing the number range will end at "1." If you have a second printing the number range will end at "2," etc.
Check the inside flap of the book for the price. Check the back of the book jacket for the International Standard Book Number. All first printings have the price on the inside flap and the ISBN on the back of the book jacket.