Hella Wuolijoki's "Niskavuoren Heta" - all about this female Finnish writer.

There are some articles about Hella Wuolijoki in English. I found these:
Lounela, Pekka: Hella Wuolijoki : a woman of contrasts. In journal Books from Finland. 1979 p. 120-183
Tarkka, Pekka: Open wide gates. In journal Books from Finland. 1991: 4: 226-227.
Hawkins, Hildi (transl.): Hella Wuolijoki : a versatile talent : 1886-1954. In journal Books from Finland. 1986: 2, p. 90-95
Koski, Pirkko: Hella Wuolijoki, 1886-1954. In Modern drama by women 1880s-1930s : an international anthology. London, Routledge 1996
Koski, Pirkko: Introduction. Portraits of courage : plays by Finnish women. Helsinki, Helsinki university press, 1997

There is also a monograph concerning films based on Wuolijoki's plays:
Koivunen, Anu: Performative histories, foundational fiction. Gender and sexuality in Niskavuori films. Helsinki, Finnish Literature Society, 2003.

There is at least one www-site which is about Hella Wuolijoki in English:
http://www.kirjasto.sci.fi/hellawuo.htm