Gaya APA

Drs. Robinson tarigan , M.R.P. (). . : .

Gaya Chicago

Drs. Robinson tarigan , M.R.P. . : , . .

Gaya MLA

Drs. Robinson tarigan , M.R.P. . : , . .

Gaya Turabian

Drs. Robinson tarigan , M.R.P. . : , . .