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. . : , . .