HMT ITB : Yudha Bumi Presents
“ČERVENÁ One Year Journey ofx The Blazing Fire”
https://issuu.com/yudhabumi/docs/buku_akhir_tahun__upload_ …
“MINERIA 7th Edition: New Era of Mining”
https://issuu.com/yudhabumi/docs/mineria7th_edisi …
“Kamar Gelap Yudha Bumi”