Gaya APA

Hutagalung,M.S., ., Siregar,Astar, . (2007). Gemstones of life (permata kehidupan) . : [s.n].

Gaya MLA

Hutagalung,M.S., ., Siregar,Astar, . "Gemstones of life (permata kehidupan)". : [s.n], 2007. Text.