Helen,
by Oswald Valentine [pseud.] ...
APA Citation
Sickert, O. (1894). Helen. New York [etc.]: G.P. Putnam's Sons.
MLA Citation
Sickert, Oswald. Helen. New York [etc.]: G.P. Putnam's Sons, 1894.
Warning: These citations may not always be complete (especially for serials).