Gaya APA

Gerke, S., Evers, H. (2011). Selat Malaka : jalur sempit perdagangan dunia . : [s.n.].

Gaya MLA

Gerke, Solvay., Evers, Hans-Dieter. "Selat Malaka : jalur sempit perdagangan dunia". : [s.n.], 2011. Article.