STRING_CB(source_citation, sub_cit_page_start, page)
STRING_CB(source_citation, sub_cit_even_start, event)
STRING_CB(source_citation, sub_cit_even_role_start, role)
NULL_CB(source_citation, sub_cit_data_start)
DATE_CB(source_citation, sub_cit_data_date_start, date)
STRING_CB(source_citation, sub_cit_quay_start, quality)
STRING_CB(source_citation, sub_cit_page_start, page)
STRING_CB(source_citation, sub_cit_even_start, event)
STRING_CB(source_citation, sub_cit_even_role_start, role)
NULL_CB(source_citation, sub_cit_data_start)
DATE_CB(source_citation, sub_cit_data_date_start, date)
STRING_CB(source_citation, sub_cit_quay_start, quality)