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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def extract_journal_reference(line, override_kbs_files=None):
 """Extract the journal reference from string. Extracts the journal reference from string and parses for specific journal information. """

    kbs = get_kbs(custom_kbs_files=override_kbs_files)
    references, dummy_m, dummy_c, dummy_co = parse_reference_line(line, kbs)

    for elements in references:
        for el in elements:
            if el['type'] == 'JOURNAL':
                return el