Pengaruh faktor air semen terhadap kuat tekan, kuat tarik belah, dan kuat lentur beton normal menggunakan semen portland pozzolan = Influence of water cement ratio on compressive strength, splitting tensile strength and flexural strength of normal concrete using portland pozzolan cement - Bastian Okto Bangkit Sentosa, author (Fakultas Teknik Universitas Indonesia, 2010)