Different words similar meaning? --references is NixOS speak for direct package dependencies. --requisites list all. These work with the nix-store command.
shell $ readlink --canonicalize "$(type -P which)" /nix/store/r78jv9xgxnvsm5vpasf5ldkc28pkri6r-which-2.21/bin/which $ nix-store --query --references /nix/store/r78jv9xgxnvsm5vpasf5ldkc28pkri6r-which-2.21 /nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163 which directly depends on glibc. Swap --references to --referrers for paths pointing to which.
On Guix, list/draw dependencies with guix graph.
shell guix graph --type=references which