Writing varies according to the discipline. For advice on writing in different disciplines, see these materials from the Dartmouth Writing Program:

• Writing the Academic Paper
• Writing in the Social Sciences (History and Sociology)
• Writing in the Sciences (Biology and Chemistry)
• Writing in the Humanities (Art History, English, Film, Music, Philosophy, Religion)

The Purdue OWL also has advice on writing different papers in English:

• Writing in Literature
• Writing a Book Review
• Writing about Fiction
• Writing about Literature
• Writing about Poetry