APA (7th ed.) Citation

Babbitt, E. G. (1925). Australian government tenders for trench-digging machine. [publisher not identified].

Chicago Style (17th ed.) Citation

Babbitt, E. G. Australian Government Tenders for Trench-digging Machine. Washington, D.C.: [publisher not identified], 1925.

MLA (9th ed.) Citation

Babbitt, E. G. Australian Government Tenders for Trench-digging Machine. [publisher not identified], 1925.