If you have a translation other than an NIV (many students use the KJV or NASB), use one of the other concordances, such as the The strongest Strong's exhaustive concordance of the Bible (REF 220.52033 St88) [KJV], or The strongest NASB exhaustive concordance (REF 220.520443 N48). There are several others on the shelf, all of which use the Strong's numerical system. Be sure to choose one that uses the appropriate translation.
The NIV English-Greek New Testament by 
The New International Version interlinear Greek-English New Testament : the Nestle Greek text with a literal English translation by 
Dictionary of the Later New Testament and Its Developments by 
The Macmillan Dictionary of the Bible by 
The New International Dictionary of New Testament Theology by Find your word in the appropriate concordance for the translation you are using.
(Regular Strongest Strong's Exhaustive Concordance of the Bible is KJV.)
Greek English concordance to the New Testament : with the New International Version by 
The strongest Strong's exhaustive concordance of the Bible by 
The NIV Exhaustive Concordance by 
The Strongest NASB Exhaustive Concordance by 
Strongest NIV Exhaustive Concordance by 
Basics of Biblical Greek Grammar by 
Greek Grammar Beyond the Basics by 
The New Linguistic and Exegetical Key to the Greek New Testament by 
Complete Vocabulary Guide to the Greek New Testament by 
On Conditionals in the Greek Pentateuch by 
Analytical Greek lexicon
A Greek-English Lexicon of the New Testament and Other Early Christian Literature by 
Theological Lexicon of the New Testament by 
A Concise Dictionary of New Testament Greek by 
Theological Dictionary of the New Testament by 
Theological Dictionary of the New Testament by 
Word Meanings in the New Testament by 