curl -X GET https://api.box.com/2.0/files/12345/versions \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'

BoxCollection<BoxFileVersion> previousVersions = await client.FilesManager
    .ViewVersionsAsync(id: "11111");

BoxFile file = new BoxFile(api, "id");
List<BoxFileVersion> versions = file.getVersions();
for (BoxFileVersion version : versions) {
    System.out.format("SHA1 of \"%s\": %s\n", item.getName(), version.getSha1());
}

file_id = '11111'

file_versions = client.file(file_id).get_previous_versions()
for version in file_versions:
    print('File version {0} was created at {1}'.format(version.id, version.created_at))

client.files.getVersions('12345')
	.then(versions => {
		/* versions -> {
			total_count: 1,
			entries: 
			[ { type: 'file_version',
				id: '22222',
				sha1: '359c6c1ed98081b9a69eb3513b9deced59c957f9',
				name: 'script.js',
				size: 92556,
				created_at: '2012-08-20T10:20:30-07:00',
				modified_at: '2012-11-28T13:14:58-08:00',
				modified_by: 
					{ type: 'user',
					id: '33333',
					name: 'Example User',
					login: 'user@example.com' } } ] }
		*/
	});