APA (7th ed.) Citation

Hinrichs, G. D. (1887). Flag signals of the signal service.

Chicago Style (17th ed.) Citation

Hinrichs, Gustav Dethlef. Flag Signals of the Signal Service. [S.l.], 1887.

MLA (9th ed.) Citation

Hinrichs, Gustav Dethlef. Flag Signals of the Signal Service. 1887.

Warning: These citations may not always be 100% accurate.