Gaya APA
General Statistics. (1973).
Massachusetts:
Londonn.
Gaya Chicago
General Statistics.
2.
Massachusetts:
Londonn,
1973.
Buku.
Gaya MLA
General Statistics.
2.
Massachusetts:
Londonn,
1973.
Buku.
Gaya Turabian
General Statistics.
Massachusetts:
Londonn,
1973.
Buku.