Cite
Optical Observations of Comet Hale-Bopp (C/1995 O1) at Large Heliocentric Distances Before Perihelion
MLA
H. Boehnhardt, et al. “Optical Observations of Comet Hale-Bopp (C/1995 O1) at Large Heliocentric Distances Before Perihelion.” Science, vol. 275, Mar. 1997, pp. 1909–12. EBSCOhost, widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsair&AN=edsair.doi.dedup.....36dea0f6ddb5f64a79b5fc51f2a68d92&authtype=sso&custid=ns315887.
APA
H. Boehnhardt, Nicolas Thomas, Claude Arpigny, Jean Manfroid, Kai Rembor, L. Jorda, Michael Küppers, François Colas, Heike Rauer, & Jacques Crovisier. (1997). Optical Observations of Comet Hale-Bopp (C/1995 O1) at Large Heliocentric Distances Before Perihelion. Science, 275, 1909–1912.
Chicago
H. Boehnhardt, Nicolas Thomas, Claude Arpigny, Jean Manfroid, Kai Rembor, L. Jorda, Michael Küppers, François Colas, Heike Rauer, and Jacques Crovisier. 1997. “Optical Observations of Comet Hale-Bopp (C/1995 O1) at Large Heliocentric Distances Before Perihelion.” Science 275 (March): 1909–12. http://widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsair&AN=edsair.doi.dedup.....36dea0f6ddb5f64a79b5fc51f2a68d92&authtype=sso&custid=ns315887.