Gaya APA
FREIVALDS, A. (2014).
NIEBEL'S METHODS, STANDARDS AND WORK DESIGN (KETIGA BELAS).
SINGAPORE:
INTERNATIONAL EDITION.
Gaya MLA
FREIVALDS, ANDRIS.
"NIEBEL'S METHODS, STANDARDS AND WORK DESIGN".
KETIGA BELAS
SINGAPORE:
INTERNATIONAL EDITION,
2014.
Text.