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Information about purchasing article reprints is available at www.pnas.org/page/about/reprints.

Click on the "Login" link on the top right of the home page to get to the login screen. Type your credentials into the username and password fields and click the "Login" button to access your account. You may also log in here.

After logging in, click on My Account. Click on the edit tab (upper right, under My Account). Type your new password into the "password" and "confirm password" fields and save.  After logging in, you may also change your password here.

Please use our Contact Us form for all technical-related questions. A representative will respond to your question within 24-48 business hours.

A charge will immediately appear on your bank statement under the name "Sheridan".

Please use our Contact Us form or the form in the Online eBook for all technical-related questions. A representative will respond to your question within 24-48 business hours.

In accordance with applicable law, we collect tax in all states. Sales tax is applied to the total amount of the order and is based on the shipment's destination state and local sales tax rates. Applicable sales tax is charged for electronically delivered products where required by local law. These items are considered to be "shipped" to the address that your order was billed to.

In accordance with applicable law, we collect tax in all states. Sales tax is applied to the total amount of the order and is based on the shipment's destination state and local sales tax rates. Applicable sales tax is charged for electronically delivered products where required by local law. These items are considered to be "shipped" to the address that your order was billed to.

If your order has been charged tax and you are a tax exempt organization we will refund the tax portion of your purchase.  To apply for a refund of the tax portion of your order please follow the procedure below. 

1.  Place your order.

2.  Forward a copy of the received invoice along with a copy of your tax Exempt Certificate to:

          Email: estorecancel.sbi@sheridan.com - Attn: Tax Exempt
          Fax: 734.385.1689 - Attn: Tax Exempt

3.  Once your tax information is received, a refund will be issued for the taxes if the order meets the requirements for tax exemption.

Please confirm all purchases before you complete them as we are unable to provide refunds. If you need assistance with your purchase or would like to return printed materials please contact us using our Contact Us form.