Lam studied at Utrecht University, where he was awarded a Doctor of Biology in 1919. Lam was the appointed the director of the Rijksherbarium in 1933. He retired from academic work in 1962. He was member of the Royal Netherlands Academy of Arts and Sciences since 1960.
- "H.J. Lam (1892 - 1977)". Digitaal Wetenschapshistorisch Centrum. Royal Netherlands Academy of Arts and Sciences. Retrieved 27 January 2014.
- "Lam, Herman Johannes". National Herbarium of the Netherlands. 24 July 2007. Retrieved 27 January 2014.
- "Lamiodendron Steenis | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 16 May 2021.
- International Plant Names Index. H.J.Lam.