-. (1990). Sistim pentanahan. Pusdiklat Perumtel.
Chicago Style (17th ed.) Citation-. Sistim Pentanahan. Pusdiklat Perumtel, 1990.
MLA (8th ed.) Citation-. Sistim Pentanahan. Pusdiklat Perumtel, 1990.
Warning: These citations may not always be 100% accurate.