Friedman, William E. (1998), "The evolution of double fertilization and endosperm: an historical perspective", Sexual Plant Reproduction, 11: 6–16, doi:10.1007/s004970050114, S2CID19785565
Friedman, William E. (1998), "The evolution of double fertilization and endosperm: an historical perspective", Sexual Plant Reproduction, 11: 6–16, doi:10.1007/s004970050114, S2CID19785565