Dyfyniad APA

Russell, E. F. (1954). Sentinels from space. Science Fiction Club.

Dyfyniad Arddull Chicago

Russell, Eric Frank. Sentinels from Space. London: Science Fiction Club, 1954.

Dyfyniad MLA

Russell, Eric Frank. Sentinels from Space. Science Fiction Club, 1954.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.