The phrase "are usually attributed to" is correct and usable in written English.
It can be used when discussing the common belief or acknowledgment of the origin or authorship of something, such as a quote, idea, or work.
Example: "The famous quote 'I think, therefore I am' is usually attributed to René Descartes."
Alternatives: "are often credited to" or "are commonly ascribed to".
Best seen at low tide, they are usually attributed to the theropod family.
Miliband's vocal problems are usually attributed to his nasal twang, yet an adenoidal voice never harmed Melvyn Bragg.
are usually attributed to their special design where staggered mineral platelets are embedded in a protein matrix.
Differentials in fertility in a population are usually attributed to variation in the exposure to the risk of pregnancy and the interval between births when exposed.
Sack totals are usually attributed to offensive lines, but knowing when to get rid of the football is an attribute successful quarterbacks tend to have.
The main causes of failure of copper nickel alloy components in seawater are usually attributed to either erosion corrosion at extreme velocities or the pitting phenomena.
Fast magnetic field polarity changes detected in the quiet magnetotail by a spacecraft are usually attributed to thin cross-tail current sheet crossings.
Both programs grew from the "Mind Mapping" movement, which is more famous in Britain and other parts of Europe than in North America, and whose origins are usually attributed to Tony Buzan.
Sex differences in the brain are usually attributed to the influence of hormones, but sex-based differences in imprinting may be another mechanism by which nature spins male and female brains out of the same genome.
Sustained family conflict can cause children to experience the kinds of problems that are usually attributed to divorce: low self-esteem, depression, high anxiety, difficulty forming relationships, delinquency and withdrawal from the world.
Furthermore, in studies that do investigate road effects on genetic diversity, correlations are usually attributed to barrier effects and little attention is paid to the potentially confounding influence of mortality-caused depletion effects.
