Gaya APA
Tambunan, T.
(2007).
Personal protective equipment
(
Ed.1 Cet.4)
.
Yogyakarta:
Graha Ilmu.
Gaya MLA
Tambunan, Tigor.
"Personal protective equipment".
Ed.1 Cet.4
Yogyakarta:
Graha Ilmu,
2007.
Text.