APA
Bultmann R. K., . (1997). What is theology?. Minneapolis: Fortress Press.
Chicago
Bultmann Rudolf Karl, . 1997. What is theology?. Minneapolis: Fortress Press.
Harvard
Bultmann R. K., . (1997). What is theology?. Minneapolis: Fortress Press.
MLA
Bultmann Rudolf Karl, . What is theology?. Minneapolis: Fortress Press. 1997.