The Level 1 package includes the 3 core modules plus a module of your choice:
Financial Reporting:
     Petroleum Accounting Principles and Issues, 7th Edition. Copyright 2011, By: Brock, Carnes & Justice
     What is Sarbanes-Oxley? By: Guy P. Lander

Operations:
     Fundamentals of Petroleum. 5th Edtion. By: Debby Henehy
Law:
     Oil and Gas Law in a Nutshell. 4th Edition. By: John S. Lowe
     Barron's Business Law. 4th Edition. By: Robert W. Emerson, J.D. 
Plus the study materials for 1 module of your choice, which you must select before your transaction will be completed:
     Audit
     Joint Interest
     Tax
     Managerial Accounting
     Revenue

 "COPAS and the APA® Board of Examiners encourage APA® candidates to study all of the material in the reference outline.  For a complete list of study material, APA® candidates should refer to the reference outline for each module, contained in the COPAS APA® Accreditation Information handbook."

*** Petroleum Accounting Principles, Procedures and Issues, 7th Edition, by Brock is on back order until January 2012. Your study materials will be sent without this book and will then be shipped to you by the end of January 2012. ***