APA (7th ed.) Citation

Vieira, T. (2011). Response to the letter "Ambulatory oxygen: Is the 6 minute walk test the best option?". Sociedade Portuguesa de Pneumologia.

Chicago Style (17th ed.) Citation

Vieira, T. Response to the Letter "Ambulatory Oxygen: Is the 6 Minute Walk Test the Best Option?". Sociedade Portuguesa de Pneumologia, 2011.

MLA (9th ed.) Citation

Vieira, T. Response to the Letter "Ambulatory Oxygen: Is the 6 Minute Walk Test the Best Option?". Sociedade Portuguesa de Pneumologia, 2011.

Warning: These citations may not always be 100% accurate.