My recommendations:

Evidence Explained: History Sources from Artifacts to Cyberspace
 3rd Edition Revised 
by Elizabeth Shown Mills

This is great book for genealogical citations of all kinds. Whatever source you need to cite, the examples and explanations can be found in this book. 

Professional Genealogy: A Manual for Researchers, Writers, Editors, Lecturers, and Librarians 
by Elizabeth Shown Mils

The title of this book is self-explanatory. It is the manual for the professional genealogist and all of those who would like to become one. Filled with  great examples about how to achieve professional level in genealogy. 

Genealogy Standards Second 
Edition 2nd Edition 
by Board for Certification of Genealogists 

This is a book that can give you an understanding about how well are you performing your genealogical work. Professionals are guided by the standards that are explained in this book. 

This is the official manual from the Board of Certification for Genealogists (BCG). 

The Family Tree Guide to DNA Testing 
and Genetic Genealogy 
by Blaine T. Bettinger 

DNA test results are fairly new in genealogy. This book explains the processes and differences between available tests. It also gives tips to understanding the results. 

Tracing Your Ancestors Using DNA: A Guide for Family Historians 
by Graham S. Holton

This books gives simple and direct explanation about DNA, different DNA tests, and examples for each. If you are planning on doing DNA test this would be the best book to read before you buy a test. It will give you understanding what DNA test is the best for you and what you need.  

Enciklopedija hrvatskih prezimena (A-L): Encyclopedia of Croatian Surnames (Volume 1)
 (Croatian Edition) 
by Dr. Sinisa Grgic 

This book covers most popular Croatian  surnames in alphabetical order from A to L. 

Enciklopedija hrvatskih prezimena (M-Z): Encyclopedia of Croatian Surnames (Volume 2) 
(Croatian Edition) 2nd Edition 
by Dr. Sinisa Grgic (Author) 

This is a second book from the series. It contains the most popular Croatian surnames in alphabetical order from M to Ž.

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