Nugroho, Guntur. “Pengaruh Mode Shape Frekuensi Alami Terhadap Estimasi Gaya Tarik Batang Baja Dengan Metode Vibrasi”. Semesta Teknika 21, no. 2 (December 17, 2018): 198–205. Accessed April 30, 2025. https://journal.umy.ac.id/index.php/st/article/view/5199.