Gaya APA

Suryadharma, H., wigroho, H, Y. (1998). Alat- Alat Berat (Ed. 1 Cet. 1). Yogyakarta: UAJY.

Gaya MLA

Suryadharma, Hendra., wigroho, Haryanto, Yoso. "Alat- Alat Berat". Ed. 1 Cet. 1 Yogyakarta: UAJY, 1998. Text.