Gaya APA
Pedoman Dasar (Bahagian Tanaman). (1992).
Tebing Tinggi:
PT. Perkebunan IV.
Gaya Chicago
Pedoman Dasar (Bahagian Tanaman).
.
Tebing Tinggi:
PT. Perkebunan IV,
1992.
Text.
Gaya MLA
Pedoman Dasar (Bahagian Tanaman).
.
Tebing Tinggi:
PT. Perkebunan IV,
1992.
Text.
Gaya Turabian
Pedoman Dasar (Bahagian Tanaman).
Tebing Tinggi:
PT. Perkebunan IV,
1992.
Print.