Техника - молодежи №07 2001
Tekhnika Molodezhi Magazine
The Knights of the Black Earth
Margaret Weis & Don Perrin
Mag Force 7 (1)
Крокодил, 1937 , № 33
Krokodil Magazine
Наука и жизнь #11 1951
Nauka i Zhizn Magazine
We Don’t Plummet Out of the Sky Anymore
M. David Blake