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Payment for use of Website


Image of the front covers of the two versions of the text 

Website Payment


Follow these steps to purchase items using your credit card, debit card, bank account, or PayPal account.

1. Click the "Add to Cart" button for the item that you want.

2. If you want to select another item, click on the "Continue Shopping" button.

3. When you have completed your selections, click on the "PayPal Check out" button in the shopping cart to pay with your PayPal account or click on the "Check Out" button to pay with a credit card.

4. Follow the remaining instructions.

If there are questions about payment or anything else, please feel free to send an email to


If you use this Internet site regularly and if you don't feel the need for the printed textbook, I ask that you pay $20 for using the electronic text and tools on this site. Click on the button below to make this payment.