APA

Kaltofen R. S., . (1971). Embryonic development in the eggs of the Pekin Duck. Wageningen: Centre for Agricultural Publishing and Documentation.

Chicago

Kaltofen R S, . 1971. Embryonic development in the eggs of the Pekin Duck. Wageningen: Centre for Agricultural Publishing and Documentation.

Harvard

Kaltofen R. S., . (1971). Embryonic development in the eggs of the Pekin Duck. Wageningen: Centre for Agricultural Publishing and Documentation.

MLA

Kaltofen R S, . Embryonic development in the eggs of the Pekin Duck. Wageningen: Centre for Agricultural Publishing and Documentation. 1971.