There are many of these styles. Do you have a link to the style guide you want?

Here's is a list of Italian and English styles that use small-caps anywhere to help you narrow things down. Some of these don't even use them for authors, but some do seem to fit your criteria, e.g. a very quick look shows that
archeologia-classica.csl
bollettino-d-archeologia-online.csl
civilta-italiana.csl
all do use Small Caps for both

Italian
aib-studi.csl
archeologia-classica.csl
bollettino-d-archeologia-online.csl
civilta-italiana.csl
einaudi.csl
facolta-teologica-dell-italia-settentrionale-milano.csl
g-giappichelli-editore.csl
pontifical-gregorian-university.csl
universita-pontificia-salesiana-it.csl

English
acm-siggraph.csl
acta-chiropterologica.csl
acta-psychiatrica-scandinavica.csl
acta-universitatis-agriculturae-et-silviculturae-mendelianae-brunensis.csl
acta-zoologica-academiae-scientiarum-hungaricae.csl
amsterdam-university-press-academic.csl
annalen-des-naturhistorischen-museums-in-wien.csl
antarctic-science.csl
antiquity.csl
australian-journal-of-earth-sciences.csl
biological-reviews.csl
biotropica.csl
bluebook2.csl
bluebook-inline.csl
bluebook-law-review.csl
bulletin-of-geosciences.csl
continuity-and-change.csl
contributions-to-the-archaeology-of-egypt-nubia-and-the-levant.csl
de-montfort-university-harvard.csl
diatom-research.csl
digital-scholarship-in-the-humanities.csl
econometrica.csl
european-journal-of-entomology.csl
european-journal-of-information-systems.csl
european-journal-of-theology.csl
fold-and-r.csl
freshwater-crayfish.csl
geological-magazine.csl
griffith-college-harvard.csl
institute-of-mathematical-statistics.csl
institute-of-mathematics-and-its-applications.csl
institut-francais-darcheologie-orientale-en.csl
international-journal-of-language-and-communication-disorders.csl
international-studies-association.csl
journal-for-the-history-of-astronomy.csl
journal-of-advertising-research.csl
journal-of-applied-philosophy.csl
journal-of-field-ornithology.csl
journal-of-mammalogy.csl
journal-of-political-philosophy.csl
journal-of-the-royal-anthropological-institute.csl
journal-of-the-royal-society-of-western-australia.csl
journal-of-threatened-taxa.csl
kth-royal-institute-of-technology-school-of-computer-science-and-communication.csl
language.csl
manchester-university-press.csl
manchester-university-press-author-date.csl
microscopy-and-microanalysis.csl
modern-humanities-research-association.csl
modern-humanities-research-association-author-date.csl
modern-phytomorphology.csl
museum-national-dhistoire-naturelle.csl
myrmecological-news.csl
new-harts-rules-the-oxford-style-guide.csl
oryx.csl
oxford-the-university-of-new-south-wales.csl
palaeodiversity.csl
palaeontographica-abteilung-b-palaeobotany-palaeophytology.csl
palaios.csl
philosophy-and-public-affairs.csl
rhodora.csl
the-american-midland-naturalist.csl
the-auk.csl
the-british-journal-of-criminology.csl
the-journal-of-agricultural-science.csl
the-journal-of-juristic-papyrology.csl
the-journal-of-parasitology.csl
the-journal-of-the-torrey-botanical-society.csl
the-journal-of-transport-history.csl
university-of-york-mhra.csl
weed-research.csl
xenotransplantation.csl