This commentary by respected New Testament scholar Gordon D. Fee is a scholarly yet thoroughly readable study of Paul's letter to the suffering community of believers in Philippi. Working directly from the Greek text but basing his comments on the New International Version, Fee sets Paul's letter to the Philippians squarely within the context of first-century "friendship" and "moral exhortation" to a church facing opposition because of its loyalty to Jesus Christ. At the same time Fee gives equal concern to the letter's theological and spiritual relevance. Important features of this commentary include a remarkable comparison of Philippians to two well-known types of letters in the Greco-Roman world: the letter of friendship and the letter of moral exhortation; an introduction that discusses the occasion, authenticity, and theological contributions of Philippians; and scholarly insights that resolve many of the formal and structural issues that have long puzzled New Testament scholars.
O'Brien's study on the Book of Philippians is a contribution to The New International Greek Testament Commentary, a series based on the UBS Greek New Testament and which seeks to provide thorough exegesis of the text that is sensitive to theological themes as well as to the details of the historical, linguistic, and textual context.
Worthy alternatives include: Reumann, Hansen, Hawthorne, Thurston and Ryan
Paul's Letter to the Philippians by 
The Epistle to the Philippians by 