Polycarp's letter to the Philippians
- Polycarp's letter to the Philippians (William Wake translation), from The Suppressed Gospels and Epistles, 18th century
- Polycarp's letter to the Philippians (Lightfoot translation), 19th century
- Polycarp's letter to the Philippians (Roberts-Donaldson translation), from Ante-Nicene Christian Library, 19th century
Works about the epistle
- Introductory Note to the Epistle of Polycarp to the Philippians by Arthur Cleveland Coxe, from Ante-Nicene Fathers
- “Polycarpus, bishop of Smyrna,” in A Dictionary of Christian Biography and Literature, 1911
- “St. Polycarp,” in Catholic Encyclopedia, 1913.