APA-referens (7:e uppl.)

Esguerra, N. A. Price modeling of the non-load bearing concrete hollow blocks (CHBs) manufactured in Ilocos Sur. Philippine Engineering Journal.

Chicago-referens (17:e uppl.)

Esguerra, Norma A. "Price Modeling of the Non-load Bearing Concrete Hollow Blocks (CHBs) Manufactured in Ilocos Sur." Philippine Engineering Journal .

MLA-referens (9:e uppl.)

Esguerra, Norma A. "Price Modeling of the Non-load Bearing Concrete Hollow Blocks (CHBs) Manufactured in Ilocos Sur." Philippine Engineering Journal, .