Cita APA (7a ed.)
Vanäs, E. (1939). A spectrophotometric Study of stars in Cygnus.
Cita Chicago Style (17a ed.)
Vanäs, Erik. A Spectrophotometric Study of Stars in Cygnus. Uppsala, 1939.
Cita MLA (9a ed.)
Vanäs, Erik. A Spectrophotometric Study of Stars in Cygnus. 1939.
Precaución: Estas citas no son 100% exactas.