APA
Letham R., . (2019). Systematic theology. Wheaton: Crossway.
Chicago
Letham Robert, . 2019. Systematic theology. Wheaton: Crossway.
Harvard
Letham R., . (2019). Systematic theology. Wheaton: Crossway.
MLA
Letham Robert, . Systematic theology. Wheaton: Crossway. 2019.