APA

Liebmann F. M., Standley P. C., .Botany: some Rubiaceae collected in Mexico in 1841-43. : .

Chicago

Liebmann Frederik M, Standley Paul C, .Botany: some Rubiaceae collected in Mexico in 1841-43. : .

Harvard

Liebmann F. M., Standley P. C., .Botany: some Rubiaceae collected in Mexico in 1841-43. : .

MLA

Liebmann Frederik M, Standley Paul C, .: . .