APA استشهاد

Maidl, B. (2008). Hardrock tunnel boring machines. Ernst and sohn.

استشهاد بنمط شيكاغو

Maidl, Bernhard...[et.al]. Hardrock Tunnel Boring Machines. Berlin: Ernst and sohn, 2008.

MLA استشهاد

Maidl, Bernhard...[et.al]. Hardrock Tunnel Boring Machines. Ernst and sohn, 2008.