Cite
β Pictoris: the variable CaII H & K absorptions from 1994 to 1996.
MLA
Petterson, Orlon K. L., and William Tobin. “β Pictoris: The Variable CaII H & K Absorptions from 1994 to 1996.” Monthly Notices of the Royal Astronomical Society, vol. 304, no. 4, Apr. 1999, pp. 733–42. EBSCOhost, https://doi.org/10.1046/j.1365-8711.1999.02262.x.
APA
Petterson, O. K. L., & Tobin, W. (1999). β Pictoris: the variable CaII H & K absorptions from 1994 to 1996. Monthly Notices of the Royal Astronomical Society, 304(4), 733–742. https://doi.org/10.1046/j.1365-8711.1999.02262.x
Chicago
Petterson, Orlon K. L., and William Tobin. 1999. “β Pictoris: The Variable CaII H & K Absorptions from 1994 to 1996.” Monthly Notices of the Royal Astronomical Society 304 (4): 733–42. doi:10.1046/j.1365-8711.1999.02262.x.