There is an e-Sword module available for the writings of Tertullian. Try the Ante-Nice Fathers, Volume 3. This can be downloaded from within e-Sword by opening on the Download menu then Reference Books. I believe that most, if not all, of the surviving records of Terullian are found there-in; including The Apology. I have provided the Table of Contents below:
Part First
The Apology
On Idolatry
The Shows, or De Spectaculis
The Chaplet, or De Corona
To Scapula
Ad NationesBook I.
Book II.
Appendix, Fragment
An Answer to the Jews
The Soul’s Testimony
A Treatise on the Soul
Part Second
The Prescription Against Heretics
The Five Books Against MarcionBook I.
Book II.
Book III.
Book IV.
Book V.
Against Hermogenes
Against the Valentinians
On the Flesh of Christ
On the Resurrection of the Flesh
Against Praxeas
Scorpiace
Appendix. Against All Heresies
Part Third
On Repentance
On Baptism
On Prayer
Ad Martyras
Appendix. The Martyrdom of Perpetua and Felicitas
Of Patience
That was it exactly.... THANKS.,