1. Physics of the Earth;Fleming,1939
2. Chapman, S., , and J., Bartels, , , Geomagnetism, (2 volumes), Oxford University Press, , Cambridge, , 1940, , in press. [The symbols for the variations used in the text have been taken from this book.]
3. Bartels, J., , H. F., Johnston, , Terr. Mag., 44, 455-469 1939,
4. Bartels, J., , , Zs. Geophysik, , 14, , 68– -78 , 230f., 272f. ( 1938, ); 15, 214–221, 333–335 (1939).
5. Bartels, J., , Gerlands Beitr. Geophysik, 55, 193-203 1939,