El Método BillingsDra. Evelyn Billings, Dra. Ann WestMore, Pam Brewster, Equipo Editorial, Raúl Ostos García · First published 2016Open the Tome
O método BillingsEvelyn Billings, Ann Westmore, Guilherme Gibbons · First published 1988Open the Tome
The Billings method of natural family planningEvelyn Billings, Ann Westmore · First published 1988Open the Tome
The Billings Method Controlling Fertility Without Drugs Or DevicesBillings, Evelyn & Westomore, Ann · First published 1980Open the Tome
