Gaya APA
Santayana, G. (1938).
The realm of truth: Book third of Realms of being. .
New York:
New York Charles Scribner's Sons.
Gaya MLA
Santayana, George.
"The realm of truth: Book third of Realms of being. ".
New York:
New York Charles Scribner's Sons,
1938.
Buku.