1948. The flight of birds. Cranbrook Inst. Sci. Bull. 28: 94 p.
Storr, G. M.
1958. Migration routes of the Arctic Tern. Emu 58(1): 59-62.
Sutter, E.
1957. Radar-Beobachtungen uber den Verlauf des nachtlichen Vogelzuges. Rev. Suisse Zool. 64: 294-303.
Swan, L. W.
1970. Goose of the Himalayas. Nat. Hist. 79(10): 68-75.
Swarth, H. S.
1920. Revision of the avian genus Passerella, with special reference to the distribution and migration of the races in California. Univ. Calif. Pub. Zool. 21(4): 75-224.
Swirski, Z.