Gaya APA
Ikranegara, Y.
().
Asas Mula Danau TOBA
(
1)
.
Surabaya:
Cahaya Agency.
Gaya MLA
Ikranegara, Yudhistira.
"Asas Mula Danau TOBA".
1
Surabaya:
Cahaya Agency,
.
Text.