APA Style
Luhmann, Niklas. (1990).
Essays on self-reference .
New York:
Columbia University Press.
Chicago Style
Luhmann, Niklas.
Essays on self-reference.
New York:
Columbia University Press,
1990.
Buku Teks.
MLA Style
Luhmann, Niklas.
Essays on self-reference.
New York:
Columbia University Press,
1990.
Buku Teks.
Turabian Style
Luhmann, Niklas.
Essays on self-reference.
New York:
Columbia University Press,
1990.
Buku Teks.