The phrase "according to a written statement" is correct and usable in written English.
It can be used when referencing information or claims that are documented in a formal written format.
Example: "According to a written statement provided by the company, all employees are required to complete the training by the end of the month."
Alternatives: "as stated in a written document" or "based on a written declaration".
The management office has told the company to stop, according to a written statement.
He has not been able to visit Baghdad since 1997, according to a written statement by Mondo Melodia.
According to a written statement that she filed with the police, Mayweather grew angry when he heard that she was having a romantic relationship with another man.
"I punched Papo on his right side, I punched him a second time and he fell in the tub," according to a written statement signed by Ms. Molina.
However, his comments did little to convince Miss Moth that she would not face a lifetime of illness, according to a written statement submitted to the hearing by Dr Bick.
The intern said she was repeatedly humiliated, sexually harassed and intimidated by Mr. Smirnoff on that occasion and others, according to a written statement from her that was obtained by The New York Times.
Several days after the second interview, according to Seo, Won sent a written statement to the task force that, Seo says, admitted "serious scientific misconduct in both papers".
"In light of the recent devastating earthquake in Port-au-Prince, New York's Haitian residents have sadly been a target for immigration scams, bringing further pain to a community that has already suffered so much," Mr. Cuomo said, according to the written statement.
The desk officer, Lieutenant Nellis, spoke with the woman, who according to the written statements told him that her assailant had given her a Police Benevolent Association union card with what he said was his name on it.
"The food truck industry in Chicago has been held back by unnecessary restrictions, and my administration is committed to common-sense changes that will allow this industry to thrive, creating jobs and supporting a vibrant food culture across the city," the mayor said in a written statement, according to CBS Chicago.
Bonkowski admitted in a written statement to putting bleach in the drink, according to The Morning Sun.
