Παραπομπή APA

(1992). Microtunnelling: Proceedings of the 2nd International Symposium, Microtunnelling, Munich, 8th April 1992. Rotterdam: A. A. Balkema.

Παραπομπή Chicago Style

Microtunnelling: Proceedings of the 2nd International Symposium, Microtunnelling, Munich, 8th April 1992. Rotterdam: A. A. Balkema, 1992.

Παραπομπή MLA

Microtunnelling: Proceedings of the 2nd International Symposium, Microtunnelling, Munich, 8th April 1992. Rotterdam: A. A. Balkema, 1992.

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