Gaya APA
Hendra, S., Wigroho, H., Y. (1998).
Alat-Alat Berat (ed.1 Cet.1).
liberti,Yogyakarta:
Penerbitan Universitas Atma Jaya Yogyakarta.
Gaya MLA
Suryadharma, Hendra., Wigroho, Haryanto, Yoso.
"Alat-Alat Berat".
ed.1 Cet.1
liberti,Yogyakarta:
Penerbitan Universitas Atma Jaya Yogyakarta,
1998.
Textbook.