E/M Specialty Certification Question

I am preparing to take the E/M Specialty Certification. On the list of approved manuals, along with the usual AMA CPT, ICD-10, HCPCS ll, I'm allowed to bring the '95 & '97 CMS DG's, audit worksheet & also:

Optional References:
One reference of your choice

Does anyone have any suggestions on what to bring for an Optional Reference of my choice?

It says you cannot bring:

Current Procedural Coding Expert® - Ingenix
Procedural Coding Professional - Contexo
Procedural Coding Professional - AAPC
Procedural Coding Expert - Contexo
Procedural Coding Expert - AAPC
CPT® Insider's View - AMA
CPT® Plus! - PMIC
Coders' Choice CPT® - PMIC
ICD-10-CM Easy Coder

Any other tips you might have about the exam in general are appreciated.

Thanks so much in advance.

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E/M Specialty Certification Question