APA
Geisler N. L., . (1989). Christian ethics. Grand Rapids: Baker Books.
Chicago
Geisler Norman L, . 1989. Christian ethics. Grand Rapids: Baker Books.
Harvard
Geisler N. L., . (1989). Christian ethics. Grand Rapids: Baker Books.
MLA
Geisler Norman L, . Christian ethics. Grand Rapids: Baker Books. 1989.