The most reliable source is the university’s own brand toolkit. ANU provides official EPS and PNG files of their logo, coat of arms, and secondary graphics in full color and black only versions. Search for "ANU Brand Assets" or "ANU Visual Identity Guide." You will find:
Nothing looks more professional than a subtle, grayscale ANU crest at the top of a PhD thesis. Using a 10% tint of black for the crest linework adds depth without violating print guidelines. anu clipart black and white